diff --git a/pd-lib-builder/CHANGELOG.txt b/pd-lib-builder/CHANGELOG.txt
index 5bdfce6..c432148 100644
--- a/pd-lib-builder/CHANGELOG.txt
+++ b/pd-lib-builder/CHANGELOG.txt
@@ -1,5 +1,13 @@
 Changelog for Makefile.pdlibbuilder.
 
+v0.7.0, dated 2023-07-06
+- build double-precision externals with the 'floatsize' variable
+- allow building multiple flavours of an external side-by-side (#78)
+- facilitate multiple platform co-installation of shared lib (#58)
+- fix use of shared.ldflags with helper-library (#64)
+- fix broken armv6l platform detection (#71)
+- improve documentation
+
 v0.6.0, dated 2019-12-21
 - detect target platform (OS and architecture) rather than build platform (#55)
 - introduce optional user variable 'PLATFORM' for cross compilation
diff --git a/pd-lib-builder/Makefile.pdlibbuilder b/pd-lib-builder/Makefile.pdlibbuilder
index 7d6c11c..38a1220 100644
--- a/pd-lib-builder/Makefile.pdlibbuilder
+++ b/pd-lib-builder/Makefile.pdlibbuilder
@@ -1,5 +1,5 @@
 # Makefile.pdlibbuilder dated 2019-12-21
-version = 0.6.0
+version = 0.7.0
 
 # Helper makefile for Pure Data external libraries.
 # Written by Katja Vetter March-June 2015 for the public domain. No warranties.
@@ -102,6 +102,8 @@ version = 0.6.0
 # Optional user variables for make command line or environment:
 #
 # - PLATFORM
+# - extension
+# - floatsize
 #
 # Deprecated path variables:
 #
@@ -205,6 +207,19 @@ version = 0.6.0
 # will then be autodefined accordingly. In most cases no other variables need to
 # be overridden.
 #
+# extension:
+# Extension for the external to use. Example: m_amd64
+# A sane default is picked, but it is useful if you want to provide
+# co-installable externals for multiple platforms (for the same operating
+# systems)
+#
+# floatsize:
+# the size of the t_float in bits. Example: 32
+# t_float are usually single precision (32bit), which is the default.
+# For double precision use floatsize=64
+# When building double precision externals, you will want to set the extension
+# as well, e.g. extension=windows-amd64-64.dll (<system>-<cpu>-<floatsize>.<ext>)
+#
 # CPPFLAGS:
 # Preprocessor flags which are not strictly required for building.
 #
@@ -369,78 +384,6 @@ externalsdir ?= ..
 Makefile.pdlibbuilder = true
 
 
-################################################################################
-### variables: library name and version ########################################
-################################################################################
-
-
-# strip possibles spaces from lib.name, they mess up calculated file names
-lib.name := $(strip $(lib.name))
-
-# if meta file exists, check library version
-metafile := $(wildcard $(lib.name)-meta.pd)
-
-ifdef metafile
-  lib.version := $(shell sed -n \
-    's|^\#X text [0-9][0-9]* [0-9][0-9]* VERSION \(.*\);|\1|p' \
-    $(metafile))
-endif
-
-
-################################################################################
-### variables: files ###########################################################
-################################################################################
-
-
-#=== sources ===================================================================
-
-
-# (re)define <classname>.class.sources using file names in class.sources
-
-define add-class-source
-$(notdir $(basename $v)).class.sources += $v
-endef
-
-$(foreach v, $(class.sources), $(eval $(add-class-source)))
-
-# derive class names from <classname>.class.sources variables
-sourcevariables := $(filter %.class.sources, $(.VARIABLES))
-classes := $(basename $(basename $(sourcevariables)))
-
-# accumulate all source files specified in makefile
-classes.sources := $(sort $(foreach v, $(sourcevariables), $($v)))
-all.sources := $(classes.sources) $(lib.setup.sources) \
-  $(shared.sources) $(common.sources)
-
-
-#=== object files ==============================================================
-
-
-# construct object filenames from all C and C++ source file names
-classes.objects := $(addsuffix .o, $(basename $(classes.sources)))
-common.objects := $(addsuffix .o, $(basename $(common.sources)))
-shared.objects := $(addsuffix .o, $(basename $(shared.sources)))
-lib.setup.objects := $(addsuffix .o, $(basename $(lib.setup.sources)))
-all.objects = $(classes.objects) $(common.objects) $(shared.objects) \
-  $(lib.setup.objects)
-
-
-#=== executables ===============================================================
-
-
-# use recursive variables here because executable extension is not yet known
-
-# construct class executable names from class names
-classes.executables = $(addsuffix .$(extension), $(classes))
-
-# construct shared lib executable name if shared sources are defined
-ifdef shared.sources
-  shared.lib = lib$(lib.name).$(shared.extension)
-else
-  shared.lib =
-endif
-
-
 ################################################################################
 ### target platform detection ##################################################
 ################################################################################
@@ -514,6 +457,14 @@ target.arch := $(firstword $(target.triplet))
 ### variables per platform #####################################################
 ################################################################################
 
+#=== flags per floatsize == ====================================================
+floatsize = 32
+ifneq ($(filter-out 32,$(floatsize)),)
+  floatsize.flags = -DPD_FLOATSIZE=$(floatsize)
+else
+  floatsize.flags =
+endif
+
 
 #=== flags per architecture ====================================================
 
@@ -523,7 +474,7 @@ target.arch := $(firstword $(target.triplet))
 # $ gcc -Q --help=target
 
 # ARMv6: Raspberry Pi 1st gen, not detectable from target.arch
-ifeq ($(shell uname), armv6l)
+ifeq ($(shell uname -m), armv6l)
   arch.c.flags = -march=armv6 -mfpu=vfp -mfloat-abi=hard
 
 # ARMv7: Beagle, Udoo, RPi2 etc.
@@ -565,7 +516,7 @@ ifeq ($(system), Linux)
   cxx.ldflags := -rdynamic -shared -fPIC -Wl,-rpath,"\$$ORIGIN",--enable-new-dtags
   cxx.ldlibs := -lc -lm -lstdc++
   shared.extension = so
-  shared.ldflags := -rdynamic -fPIC -shared -Wl,-soname,$(shared.lib)
+  shared.ldflags = -rdynamic -fPIC -shared -Wl,-soname,$(shared.lib)
 endif
 
 
@@ -656,14 +607,14 @@ ifeq ($(system), Windows)
   extension = dll
   c.flags :=
   c.ldflags := -static-libgcc -shared \
-    -Wl,--enable-auto-import "$(PDBINDIR)/pd.dll"
+    -Wl,--enable-auto-import "$(PDBINDIR)/pd$(filter-out 32,$(floatsize)).dll"
   c.ldlibs :=
   cxx.flags := -fcheck-new
   cxx.ldflags := -static-libgcc -static-libstdc++ -shared \
-    -Wl,--enable-auto-import "$(PDBINDIR)/pd.dll"
+    -Wl,--enable-auto-import "$(PDBINDIR)/pd$(filter-out 32,$(floatsize)).dll"
   cxx.ldlibs :=
   shared.extension = dll
-  shared.ldflags := -static-libgcc -shared "$(PDBINDIR)/pd.dll"
+  shared.ldflags := -static-libgcc -shared "$(PDBINDIR)/pd$(filter-out 32,$(floatsize)).dll"
   stripflags = --strip-all
 endif
 
@@ -711,7 +662,7 @@ endif
 CFLAGS = $(warn.flags) $(optimization.flags) $(arch.c.flags)
 
 # preprocessor flags
-cpp.flags := -DPD -I "$(PDINCLUDEDIR)" $(cpp.flags) $(CPPFLAGS)
+cpp.flags := -DPD -I "$(PDINCLUDEDIR)" $(floatsize.flags) $(cpp.flags) $(CPPFLAGS)
 
 # flags for dependency checking (cflags from makefile may define -I options)
 depcheck.flags := $(cpp.flags) $(cflags)
@@ -720,7 +671,7 @@ depcheck.flags := $(cpp.flags) $(cflags)
 LDFLAGS := $(arch.ld.flags)
 
 # now add the same ld flags to shared dynamic lib
-shared.ldflags := $(shared.ldflags) $(LDFLAGS)
+shared.ldflags += $(LDFLAGS)
 
 # accumulated flags for C compiler / linker
 c.flags := $(cpp.flags) $(c.flags) $(cflags) $(CFLAGS)
@@ -733,6 +684,84 @@ cxx.ldflags := $(cxx.ldflags) $(ldflags) $(LDFLAGS)
 cxx.ldlibs := $(cxx.ldlibs) $(ldlibs)
 
 
+################################################################################
+### variables: library name and version ########################################
+################################################################################
+
+
+# strip possibles spaces from lib.name, they mess up calculated file names
+lib.name := $(strip $(lib.name))
+
+# if meta file exists, check library version
+metafile := $(wildcard $(lib.name)-meta.pd)
+
+ifdef metafile
+  lib.version := $(shell sed -n \
+    's|^\#X text [0-9][0-9]* [0-9][0-9]* VERSION \(.*\);|\1|p' \
+    $(metafile))
+endif
+
+
+################################################################################
+### variables: files ###########################################################
+################################################################################
+
+object.extension = $(extension).o
+
+#=== sources ===================================================================
+
+
+# (re)define <classname>.class.sources using file names in class.sources
+
+define add-class-source
+$(notdir $(basename $v)).class.sources += $v
+endef
+
+$(foreach v, $(class.sources), $(eval $(add-class-source)))
+
+# derive class names from <classname>.class.sources variables
+sourcevariables := $(filter %.class.sources, $(.VARIABLES))
+classes := $(basename $(basename $(sourcevariables)))
+
+# accumulate all source files specified in makefile
+classes.sources := $(sort $(foreach v, $(sourcevariables), $($v)))
+all.sources := $(classes.sources) $(lib.setup.sources) \
+  $(shared.sources) $(common.sources)
+
+
+#=== object files ==============================================================
+
+
+# construct object filenames from all C and C++ source file names
+classes.objects := $(addsuffix .$(object.extension), $(basename $(classes.sources)))
+common.objects := $(addsuffix .$(object.extension), $(basename $(common.sources)))
+shared.objects := $(addsuffix .$(object.extension), $(basename $(shared.sources)))
+lib.setup.objects := $(addsuffix .$(object.extension), $(basename $(lib.setup.sources)))
+all.objects = $(classes.objects) $(common.objects) $(shared.objects) \
+  $(lib.setup.objects)
+
+
+#=== executables ===============================================================
+
+
+# construct class executable names from class names
+classes.executables := $(addsuffix .$(extension), $(classes))
+
+# Construct shared lib executable name if shared sources are defined.
+# If extension does not end with shared extension, use both to facilitate co-
+# installation for different platforms, like .m_i386.dll and .linux-amd64-32.so
+ifdef shared.sources
+  ifneq ($(filter %.$(shared.extension), .$(extension)), )
+    # $(extension) already ends with $(shared.extension), no need to duplicate it
+    shared.lib = lib$(lib.name).$(extension)
+  else
+    shared.lib = lib$(lib.name).$(extension).$(shared.extension)
+  endif
+else
+  shared.lib :=
+endif
+
+
 ################################################################################
 ### variables: tools ###########################################################
 ################################################################################
@@ -786,7 +815,7 @@ endif
 
 # store path to pd.dll; if not found, ls will give a useful error
 ifeq ($(system), Windows)
-  pddll := $(shell ls "$(PDBINDIR)/pd.dll")
+  pddll := $(shell ls "$(PDBINDIR)/pd$(filter-out 32,$(floatsize)).dll")
 endif
 
 # when making target all, check if m_pd.h is found and print info about it
@@ -870,8 +899,8 @@ define link-class
   $(compile-$1) \
   $($1.ldflags) $($2.class.ldflags) \
   -o $2.$(extension) \
-  $(addsuffix .o, $(basename $($2.class.sources))) \
-  $(addsuffix .o, $(basename $(common.sources))) \
+  $(addsuffix .$(object.extension), $(basename $($2.class.sources))) \
+  $(addsuffix .$(object.extension), $(basename $(common.sources))) \
   $($1.ldlibs) $($2.class.ldlibs) $(shared.lib)
 endef
 
@@ -917,13 +946,13 @@ endif
 define link-shared
   $(compile-$1) \
   $(shared.ldflags) \
-  -o lib$(lib.name).$(shared.extension) $(shared.objects) \
+  -o $(shared.lib) $(shared.objects) \
   $($1.ldlibs) $(shared.ldlibs)
 endef
 
 # rule for linking objects in shared executable
 # build recipe is in macro 'link-shared'
-lib$(lib.name).$(shared.extension): $(shared.objects)
+$(shared.lib): $(shared.objects)
 	$(info ++++ info: linking objects in shared lib $@)
 	$(if $(filter %.cc %.cpp, $(shared.sources)), \
         $(call link-shared,cxx), \
@@ -945,13 +974,13 @@ endef
 # Three rules to create .o files. These are double colon 'terminal' rules,
 # meaning they are the last in a rules chain.
 
-%.o:: %.c
+%.$(object.extension):: %.c
 	$(call make-object-file,c)
 
-%.o:: %.cc
+%.$(object.extension):: %.cc
 	$(call make-object-file,cxx)
 
-%.o:: %.cpp
+%.$(object.extension):: %.cpp
 	$(call make-object-file,cxx)
 
 
@@ -970,8 +999,8 @@ endef
 # declare explicit prerequisites rule like 'class.extension: object1.o object2.o'
 # argument $v is class basename
 define declare-class-executable-target
-$v.$(extension): $(addsuffix .o, $(basename $($v.class.sources))) \
-  $(addsuffix .o, $(basename $(common.sources)))
+$v.$(extension): $(addsuffix .$(object.extension), $(basename $($v.class.sources))) \
+  $(addsuffix .$(object.extension), $(basename $(common.sources)))
 endef
 
 # evaluate explicit prerequisite rules for all classes
@@ -1001,7 +1030,7 @@ endif
 # argument $1 is input source file(s)
 # dir is explicitly added because option -MM strips it by default
 define declare-object-target
-$(dir $1)$(filter %.o: %.h, $(shell $(CPP) $(depcheck.flags) -MM $1)) $(MAKEFILE_LIST)
+$(dir $1)$(patsubst %.o:,%.$(object.extension):,$(filter %.o: %.h, $(shell $(CPP) $(depcheck.flags) -MM $1))) $(MAKEFILE_LIST)
 endef
 
 # evaluate implicit prerequisite rules when rebuilding everything
diff --git a/pd-lib-builder/README.md b/pd-lib-builder/README.md
index 187b132..41b37fd 100644
--- a/pd-lib-builder/README.md
+++ b/pd-lib-builder/README.md
@@ -35,7 +35,8 @@ Makefile.pdlibbuilder at the end of the Makefile. Like so:
 
       datafiles = myclass1-help.pd myclass2-help.pd README.txt LICENSE.txt
 
-      include Makefile.pdlibbuilder
+      PDLIBBUILDER_DIR=.
+      include $(PDLIBBUILDER_DIR)/Makefile.pdlibbuilder
 
 
 For files in class.sources it is assumed that class name == source file
@@ -68,6 +69,43 @@ Root directory for installation of Pd library directories. Overrides the
 default install location.
 
 
+### platform detection and predefined variables ###
+
+
+Makefile.pdlibbuilder tries to detect architecture and operating system in
+order to define platform-specific variables. Since v0.6.0 we let the compiler
+report target platform, rather than taking the build machine as reference. This
+simplifies cross compilation. The kind of build options that are predefined:
+
+- optimizations useful for realtime DSP processing
+- options strictly required for the platform
+- options to make the build work accross a range of CPU's and OS versions
+
+The exact choice and definition predefined variables changes over time, as new
+platforms arrive and older platforms become obsolete. The easiest way to get an
+overview for your platform is by checking the flags categories in the output of
+target `vars`. Variables written in capitals (like `CFLAGS`) are intentionally
+exposed as user variables, although technically all makefile variables can be
+overridden by make command arguments.
+
+
+### specific language versions ###
+
+
+Makefile.pdlibbuilder handles C and C++, but can not detect if your code uses
+features of a specific version (like C99, C++11, C++14 etc.). In such cases
+your makefile should specify that version as compiler option:
+
+    cflags = -std=c++11
+
+Also you may need to be explicit about minimum OSX version. For example, C++11
+needs OSX 10.9 or higher:
+
+    define forDarwin
+      cflags = -mmacosx-version-min=10.9
+    endef
+
+
 ### documentation ###
 
 
diff --git a/pd-lib-builder/tests/Makefile b/pd-lib-builder/tests/Makefile
new file mode 100644
index 0000000..53b261c
--- /dev/null
+++ b/pd-lib-builder/tests/Makefile
@@ -0,0 +1,15 @@
+# recursively build all example projects in the subdirectories
+
+
+makefiledirs := $(filter-out _%, $(dir $(wildcard */Makefile)))
+
+PDLIBBUILDER_DIR = ../
+include $(PDLIBBUILDER_DIR)/Makefile.pdlibbuilder
+
+buildcheck installcheck: $(makefiledirs)
+
+runcheck:
+	PDBINDIR=$(PDBINDIR) ./test-patches.sh $(makefiledirs:%=%*.pd)
+
+projects:
+	@echo $(makefiledirs)
diff --git a/pd-lib-builder/tests/_template_/Makefile b/pd-lib-builder/tests/_template_/Makefile
new file mode 100644
index 0000000..ea5fd4f
--- /dev/null
+++ b/pd-lib-builder/tests/_template_/Makefile
@@ -0,0 +1,24 @@
+# Makefile to build class '_template_' for Pure Data.
+# Needs Makefile.pdlibbuilder as helper makefile for platform-dependent build
+# settings and rules.
+
+# library name
+lib.name = _template_
+
+# input source file (class name == source file basename)
+class.sources = _template_.c
+
+# all extra files to be included in binary distribution of the library
+datafiles = _template_-help.pd _template_-meta.pd
+
+# include Makefile.pdlibbuilder
+# (for real-world projects see the "Project Management" section
+# in tips-tricks.md)
+PDLIBBUILDER_DIR=../..
+include $(PDLIBBUILDER_DIR)/Makefile.pdlibbuilder
+
+# simplistic tests whether all expected files have been produced/installed
+buildcheck: all
+	test -e _template_.$(extension)
+installcheck: install
+	test -e $(installpath)/_template_.$(extension)
diff --git a/pd-lib-builder/tests/_template_/_template_-help.pd b/pd-lib-builder/tests/_template_/_template_-help.pd
new file mode 100644
index 0000000..94425c6
--- /dev/null
+++ b/pd-lib-builder/tests/_template_/_template_-help.pd
@@ -0,0 +1,4 @@
+#N canvas 335 160 450 300 12;
+#X obj 143 125 _template_;
+#X msg 143 93 7;
+#X connect 1 0 0 0;
diff --git a/pd-lib-builder/tests/_template_/_template_-meta.pd b/pd-lib-builder/tests/_template_/_template_-meta.pd
new file mode 100644
index 0000000..7f997bf
--- /dev/null
+++ b/pd-lib-builder/tests/_template_/_template_-meta.pd
@@ -0,0 +1,9 @@
+#N canvas 966 322 200 200 10;
+#N canvas 19 51 420 300 META 0;
+#X text 10 10 META this is a prototype of a libdir meta file;
+#X text 10 51 AUTHOR IOhannes m zmolnig;
+#X text 10 110 VERSION 1.0.0;
+#X text 10 90 LICENSE CC0;
+#X text 10 70 DESCRIPTION Example "_template_" external.;
+#X text 10 30 NAME _template_;
+#X restore 10 10 pd META;
diff --git a/pd-lib-builder/tests/_template_/_template_.c b/pd-lib-builder/tests/_template_/_template_.c
new file mode 100644
index 0000000..ef5293e
--- /dev/null
+++ b/pd-lib-builder/tests/_template_/_template_.c
@@ -0,0 +1,13 @@
+#include <m_pd.h>
+t_class*_template__class;
+static void _template__float(t_object*x, t_float f1) {
+  pd_error(x, "%s got %f", __FUNCTION__, f1);
+}
+static void*_template__new(void) {
+  return pd_new(_template__class);
+}
+void _template__setup(void) {
+  post("%s", __FUNCTION__);
+  _template__class = class_new(gensym("_template_"), _template__new, 0, sizeof(t_object), 0, A_NULL);
+  class_addfloat(_template__class, _template__float);
+}
diff --git a/pd-lib-builder/tests/make-from-template.sh b/pd-lib-builder/tests/make-from-template.sh
new file mode 100755
index 0000000..d4f6ade
--- /dev/null
+++ b/pd-lib-builder/tests/make-from-template.sh
@@ -0,0 +1,46 @@
+#!/bin/sh
+
+template=_template_
+template_dir=${0%/*}/${template}
+
+outdir=$1
+outdir=${outdir%/}
+outname=${outdir##*/}
+
+
+usage() {
+    cat 1>&2 <<EOL
+usage: $0 <outdir>
+  creates a new test-directory <outdir> from _template_;
+  <outdir> must not exist yet.
+EOL
+  if [ "x$@" != "x" ]; then
+    echo
+    echo "  $@" 1>&2
+  fi
+  exit 1
+}
+
+if [ "x${outdir}" = "x" ]; then
+  usage
+fi
+
+if [ -d "${outdir}" ]; then
+  usage "output directory '${outdir}' already exists!"
+fi
+
+if [ ! -d "${template_dir}" ]; then
+  echo "unable to find '${template_dir}'" 1>&2
+  exit 1
+fi
+
+mkdir -p "${outdir}" || usage "unable to create '${outdir}'!"
+rmdir "${outdir}"
+cp -r "${template_dir}" "${outdir}"
+find "${outdir}" -type f -exec sed -e "s|${template}|${outname}|g" -i {} +
+for f in "${outdir}"/*; do
+ g=$(echo $f | sed -e "s|${template}|${outname}|g")
+ if [ "x${f}" != "x${g}" ]; then
+   mv "${f}" "${g}"
+ fi
+done
diff --git a/pd-lib-builder/tests/multifor/Makefile b/pd-lib-builder/tests/multifor/Makefile
new file mode 100644
index 0000000..48950f2
--- /dev/null
+++ b/pd-lib-builder/tests/multifor/Makefile
@@ -0,0 +1,39 @@
+# Makefile to build class 'multifor' for Pure Data.
+# Needs Makefile.pdlibbuilder as helper makefile for platform-dependent build
+# settings and rules.
+
+# library name
+lib.name = multifor
+
+# input source file (class name == source file basename)
+class.sources = multiforA.c
+
+# additional classes
+define forLinux
+  class.sources += multiforB.c
+endef
+define forDarwin
+  class.sources += multiforB.c
+endef
+define forWindows
+  class.sources += multiforB.c
+endef
+
+# all extra files to be included in binary distribution of the library
+datafiles = multifor-help.pd multifor-meta.pd
+
+# include Makefile.pdlibbuilder
+# (for real-world projects see the "Project Management" section
+# in tips-tricks.md)
+PDLIBBUILDER_DIR=../..
+include $(PDLIBBUILDER_DIR)/Makefile.pdlibbuilder
+
+# simplistic tests whether all expected files have been produced/installed
+buildcheck: all
+	test -e multiforA.$(extension)
+	test -e multiforB.$(extension)
+installcheck: install
+	test -e $(installpath)/multiforA.$(extension)
+	test -e $(installpath)/multiforB.$(extension)
+	test -e $(installpath)/multifor-help.pd
+	test -e $(installpath)/multifor-meta.pd
diff --git a/pd-lib-builder/tests/multifor/README.md b/pd-lib-builder/tests/multifor/README.md
new file mode 100644
index 0000000..6b336c7
--- /dev/null
+++ b/pd-lib-builder/tests/multifor/README.md
@@ -0,0 +1,9 @@
+multifor
+========
+
+minimal pd-lib-builder project that shows how to compile
+a library that contains multiple C-files that are compiled into
+multiple binaries each containing a different Pd-objectclass.
+some of the objectclasses are only compiled on specific platforms.
+
+this is a special case of the one-object-per-binary library structure.
diff --git a/pd-lib-builder/tests/multifor/multifor-help.pd b/pd-lib-builder/tests/multifor/multifor-help.pd
new file mode 100644
index 0000000..05d9e93
--- /dev/null
+++ b/pd-lib-builder/tests/multifor/multifor-help.pd
@@ -0,0 +1,7 @@
+#N canvas 335 160 450 300 12;
+#X msg 143 93 7;
+#X obj 143 125 multiforA;
+#X obj 223 125 multiforB;
+#X msg 223 93 12;
+#X connect 0 0 1 0;
+#X connect 3 0 2 0;
diff --git a/pd-lib-builder/tests/multifor/multifor-meta.pd b/pd-lib-builder/tests/multifor/multifor-meta.pd
new file mode 100644
index 0000000..2c696e3
--- /dev/null
+++ b/pd-lib-builder/tests/multifor/multifor-meta.pd
@@ -0,0 +1,9 @@
+#N canvas 966 322 200 200 10;
+#N canvas 19 51 420 300 META 0;
+#X text 10 10 META this is a prototype of a libdir meta file;
+#X text 10 51 AUTHOR IOhannes m zmolnig;
+#X text 10 110 VERSION 1.0.0;
+#X text 10 90 LICENSE CC0;
+#X text 10 70 DESCRIPTION Example "multifor" external.;
+#X text 10 30 NAME multifor;
+#X restore 10 10 pd META;
diff --git a/pd-lib-builder/tests/multifor/multiforA.c b/pd-lib-builder/tests/multifor/multiforA.c
new file mode 100644
index 0000000..c52f68c
--- /dev/null
+++ b/pd-lib-builder/tests/multifor/multiforA.c
@@ -0,0 +1,13 @@
+#include <m_pd.h>
+t_class*multiforA_class;
+static void multiforA_float(t_object*x, t_float f1) {
+  pd_error(x, "%s got %f", __FUNCTION__, f1);
+}
+static void*multiforA_new(void) {
+  return pd_new(multiforA_class);
+}
+void multiforA_setup(void) {
+  post("%s", __FUNCTION__);
+  multiforA_class = class_new(gensym("multiforA"), multiforA_new, 0, sizeof(t_object), 0, A_NULL);
+  class_addfloat(multiforA_class, multiforA_float);
+}
diff --git a/pd-lib-builder/tests/multifor/multiforB.c b/pd-lib-builder/tests/multifor/multiforB.c
new file mode 100644
index 0000000..74618ea
--- /dev/null
+++ b/pd-lib-builder/tests/multifor/multiforB.c
@@ -0,0 +1,13 @@
+#include <m_pd.h>
+t_class*multiforB_class;
+static void multiforB_float(t_object*x, t_float f1) {
+  pd_error(x, "%s got %f", __FUNCTION__, f1);
+}
+static void*multiforB_new(void) {
+  return pd_new(multiforB_class);
+}
+void multiforB_setup(void) {
+  post("%s", __FUNCTION__);
+  multiforB_class = class_new(gensym("multiforB"), multiforB_new, 0, sizeof(t_object), 0, A_NULL);
+  class_addfloat(multiforB_class, multiforB_float);
+}
diff --git a/pd-lib-builder/tests/multilib/Makefile b/pd-lib-builder/tests/multilib/Makefile
new file mode 100644
index 0000000..00f20dc
--- /dev/null
+++ b/pd-lib-builder/tests/multilib/Makefile
@@ -0,0 +1,32 @@
+# Makefile to build class 'multilib' for Pure Data.
+# Needs Makefile.pdlibbuilder as helper makefile for platform-dependent build
+# settings and rules.
+
+# library name
+lib.name = multilib
+
+make-lib-executable=yes
+
+# input source file (class name == source file basename)
+class.sources = multilibA.c multilibB.c
+
+# glue for building a multi-object library
+lib.setup.sources = $(lib.name).c
+
+# all extra files to be included in binary distribution of the library
+datafiles = multilib-help.pd multilib-meta.pd
+
+# include Makefile.pdlibbuilder
+# (for real-world projects see the "Project Management" section
+# in tips-tricks.md)
+PDLIBBUILDER_DIR=../..
+include $(PDLIBBUILDER_DIR)/Makefile.pdlibbuilder
+
+
+# simplistic tests whether all expected files have been produced/installed
+buildcheck: all
+	test -e multilib.$(extension)
+installcheck: install
+	test -e $(installpath)/multilib.$(extension)
+	test -e $(installpath)/multilib-help.pd
+	test -e $(installpath)/multilib-meta.pd
diff --git a/pd-lib-builder/tests/multilib/README.md b/pd-lib-builder/tests/multilib/README.md
new file mode 100644
index 0000000..4a80535
--- /dev/null
+++ b/pd-lib-builder/tests/multilib/README.md
@@ -0,0 +1,8 @@
+multilib
+========
+
+minimal pd-lib-builder project that shows how to compile
+a library that contains multiple C-files that are compiled into
+a single binary containing  different Pd-objectclasses.
+
+this is the general case of the single-binary library structure.
diff --git a/pd-lib-builder/tests/multilib/multilib-help.pd b/pd-lib-builder/tests/multilib/multilib-help.pd
new file mode 100644
index 0000000..fc3931d
--- /dev/null
+++ b/pd-lib-builder/tests/multilib/multilib-help.pd
@@ -0,0 +1,9 @@
+#N canvas 335 160 450 300 12;
+#X declare -lib multilib;
+#X msg 143 93 7;
+#X obj 143 125 multilibA;
+#X obj 223 125 multilibB;
+#X msg 223 93 12;
+#X obj 136 47 declare -lib multilib;
+#X connect 0 0 1 0;
+#X connect 3 0 2 0;
diff --git a/pd-lib-builder/tests/multilib/multilib-meta.pd b/pd-lib-builder/tests/multilib/multilib-meta.pd
new file mode 100644
index 0000000..ef08c03
--- /dev/null
+++ b/pd-lib-builder/tests/multilib/multilib-meta.pd
@@ -0,0 +1,9 @@
+#N canvas 966 322 200 200 10;
+#N canvas 19 51 420 300 META 0;
+#X text 10 10 META this is a prototype of a libdir meta file;
+#X text 10 51 AUTHOR IOhannes m zmolnig;
+#X text 10 110 VERSION 1.0.0;
+#X text 10 90 LICENSE CC0;
+#X text 10 70 DESCRIPTION Example "multiple" external.;
+#X text 10 30 NAME multiple;
+#X restore 10 10 pd META;
diff --git a/pd-lib-builder/tests/multilib/multilib.c b/pd-lib-builder/tests/multilib/multilib.c
new file mode 100644
index 0000000..82d0eac
--- /dev/null
+++ b/pd-lib-builder/tests/multilib/multilib.c
@@ -0,0 +1,8 @@
+
+void multilibA_setup(void);
+void multilibB_setup(void);
+
+void multilib_setup(void) {
+  multilibA_setup();
+  multilibB_setup();
+}
diff --git a/pd-lib-builder/tests/multilib/multilibA.c b/pd-lib-builder/tests/multilib/multilibA.c
new file mode 100644
index 0000000..4760746
--- /dev/null
+++ b/pd-lib-builder/tests/multilib/multilibA.c
@@ -0,0 +1,13 @@
+#include <m_pd.h>
+t_class*multilibA_class;
+static void multilibA_float(t_object*x, t_float f1) {
+  pd_error(x, "%s got %f", __FUNCTION__, f1);
+}
+static void*multilibA_new(void) {
+  return pd_new(multilibA_class);
+}
+void multilibA_setup(void) {
+  post("%s", __FUNCTION__);
+  multilibA_class = class_new(gensym("multilibA"), multilibA_new, 0, sizeof(t_object), 0, A_NULL);
+  class_addfloat(multilibA_class, multilibA_float);
+}
diff --git a/pd-lib-builder/tests/multilib/multilibB.c b/pd-lib-builder/tests/multilib/multilibB.c
new file mode 100644
index 0000000..ce7c4d8
--- /dev/null
+++ b/pd-lib-builder/tests/multilib/multilibB.c
@@ -0,0 +1,13 @@
+#include <m_pd.h>
+t_class*multilibB_class;
+static void multilibB_float(t_object*x, t_float f1) {
+  pd_error(x, "%s got %f", __FUNCTION__, f1);
+}
+static void*multilibB_new(void) {
+  return pd_new(multilibB_class);
+}
+void multilibB_setup(void) {
+  post("%s", __FUNCTION__);
+  multilibB_class = class_new(gensym("multilibB"), multilibB_new, 0, sizeof(t_object), 0, A_NULL);
+  class_addfloat(multilibB_class, multilibB_float);
+}
diff --git a/pd-lib-builder/tests/multiple/Makefile b/pd-lib-builder/tests/multiple/Makefile
new file mode 100644
index 0000000..eac1412
--- /dev/null
+++ b/pd-lib-builder/tests/multiple/Makefile
@@ -0,0 +1,28 @@
+# Makefile to build class 'multiple' for Pure Data.
+# Needs Makefile.pdlibbuilder as helper makefile for platform-dependent build
+# settings and rules.
+
+# library name
+lib.name = multiple
+
+# input source file (class name == source file basename)
+class.sources = multipleA.c multipleB.c
+
+# all extra files to be included in binary distribution of the library
+datafiles = multiple-help.pd multiple-meta.pd
+
+# include Makefile.pdlibbuilder
+# (for real-world projects see the "Project Management" section
+# in tips-tricks.md)
+PDLIBBUILDER_DIR=../..
+include $(PDLIBBUILDER_DIR)/Makefile.pdlibbuilder
+
+# simplistic tests whether all expected files have been produced/installed
+buildcheck: all
+	test -e multipleA.$(extension)
+	test -e multipleB.$(extension)
+installcheck: install
+	test -e $(installpath)/multipleA.$(extension)
+	test -e $(installpath)/multipleB.$(extension)
+	test -e $(installpath)/multiple-help.pd
+	test -e $(installpath)/multiple-meta.pd
diff --git a/pd-lib-builder/tests/multiple/README.md b/pd-lib-builder/tests/multiple/README.md
new file mode 100644
index 0000000..04c8c97
--- /dev/null
+++ b/pd-lib-builder/tests/multiple/README.md
@@ -0,0 +1,8 @@
+multiple
+========
+
+minimal pd-lib-builder project that shows how to compile
+a library that contains multiple C-files that are compiled into
+multiple binaries each containing a different Pd-objectclass.
+
+this is the general case of the one-object-per-binary library structure.
diff --git a/pd-lib-builder/tests/multiple/multiple-help.pd b/pd-lib-builder/tests/multiple/multiple-help.pd
new file mode 100644
index 0000000..0e4a43e
--- /dev/null
+++ b/pd-lib-builder/tests/multiple/multiple-help.pd
@@ -0,0 +1,7 @@
+#N canvas 335 160 450 300 12;
+#X msg 143 93 7;
+#X obj 143 125 multipleA;
+#X obj 223 125 multipleB;
+#X msg 223 93 12;
+#X connect 0 0 1 0;
+#X connect 3 0 2 0;
diff --git a/pd-lib-builder/tests/multiple/multiple-meta.pd b/pd-lib-builder/tests/multiple/multiple-meta.pd
new file mode 100644
index 0000000..ef08c03
--- /dev/null
+++ b/pd-lib-builder/tests/multiple/multiple-meta.pd
@@ -0,0 +1,9 @@
+#N canvas 966 322 200 200 10;
+#N canvas 19 51 420 300 META 0;
+#X text 10 10 META this is a prototype of a libdir meta file;
+#X text 10 51 AUTHOR IOhannes m zmolnig;
+#X text 10 110 VERSION 1.0.0;
+#X text 10 90 LICENSE CC0;
+#X text 10 70 DESCRIPTION Example "multiple" external.;
+#X text 10 30 NAME multiple;
+#X restore 10 10 pd META;
diff --git a/pd-lib-builder/tests/multiple/multipleA.c b/pd-lib-builder/tests/multiple/multipleA.c
new file mode 100644
index 0000000..dc7bfb0
--- /dev/null
+++ b/pd-lib-builder/tests/multiple/multipleA.c
@@ -0,0 +1,13 @@
+#include <m_pd.h>
+t_class*multipleA_class;
+static void multipleA_float(t_object*x, t_float f1) {
+  pd_error(x, "%s got %f", __FUNCTION__, f1);
+}
+static void*multipleA_new(void) {
+  return pd_new(multipleA_class);
+}
+void multipleA_setup(void) {
+  post("%s", __FUNCTION__);
+  multipleA_class = class_new(gensym("multipleA"), multipleA_new, 0, sizeof(t_object), 0, A_NULL);
+  class_addfloat(multipleA_class, multipleA_float);
+}
diff --git a/pd-lib-builder/tests/multiple/multipleB.c b/pd-lib-builder/tests/multiple/multipleB.c
new file mode 100644
index 0000000..aaf50ba
--- /dev/null
+++ b/pd-lib-builder/tests/multiple/multipleB.c
@@ -0,0 +1,13 @@
+#include <m_pd.h>
+t_class*multipleB_class;
+static void multipleB_float(t_object*x, t_float f1) {
+  pd_error(x, "%s got %f", __FUNCTION__, f1);
+}
+static void*multipleB_new(void) {
+  return pd_new(multipleB_class);
+}
+void multipleB_setup(void) {
+  post("%s", __FUNCTION__);
+  multipleB_class = class_new(gensym("multipleB"), multipleB_new, 0, sizeof(t_object), 0, A_NULL);
+  class_addfloat(multipleB_class, multipleB_float);
+}
diff --git a/pd-lib-builder/tests/multiplexx/Makefile b/pd-lib-builder/tests/multiplexx/Makefile
new file mode 100644
index 0000000..7438f0a
--- /dev/null
+++ b/pd-lib-builder/tests/multiplexx/Makefile
@@ -0,0 +1,28 @@
+# Makefile to build class 'multiplexx' for Pure Data.
+# Needs Makefile.pdlibbuilder as helper makefile for platform-dependent build
+# settings and rules.
+
+# library name
+lib.name = multiplexx
+
+# input source file (class name == source file basename)
+class.sources = multiplexxA.cpp multiplexxB.c
+
+# all extra files to be included in binary distribution of the library
+datafiles = multiplexx-help.pd multiplexx-meta.pd
+
+# include Makefile.pdlibbuilder
+# (for real-world projects see the "Project Management" section
+# in tips-tricks.md)
+PDLIBBUILDER_DIR=../..
+include $(PDLIBBUILDER_DIR)/Makefile.pdlibbuilder
+
+# simplistic tests whether all expected files have been produced/installed
+buildcheck: all
+	test -e multiplexxA.$(extension)
+	test -e multiplexxB.$(extension)
+installcheck: install
+	test -e $(installpath)/multiplexxA.$(extension)
+	test -e $(installpath)/multiplexxB.$(extension)
+	test -e $(installpath)/multiplexx-help.pd
+	test -e $(installpath)/multiplexx-meta.pd
diff --git a/pd-lib-builder/tests/multiplexx/README.md b/pd-lib-builder/tests/multiplexx/README.md
new file mode 100644
index 0000000..82aab9b
--- /dev/null
+++ b/pd-lib-builder/tests/multiplexx/README.md
@@ -0,0 +1,8 @@
+multiplexx
+========
+
+minimal pd-lib-builder project that shows how to compile
+a library that contains multiplexx C-files that are compiled into
+multiplexx binaries each containing a different Pd-objectclass.
+
+this is the general case of the one-object-per-binary library structure.
diff --git a/pd-lib-builder/tests/multiplexx/multiplexx-help.pd b/pd-lib-builder/tests/multiplexx/multiplexx-help.pd
new file mode 100644
index 0000000..b715d1a
--- /dev/null
+++ b/pd-lib-builder/tests/multiplexx/multiplexx-help.pd
@@ -0,0 +1,7 @@
+#N canvas 335 160 450 300 12;
+#X msg 143 93 7;
+#X obj 143 125 multiplexxA;
+#X obj 223 125 multiplexxB;
+#X msg 223 93 12;
+#X connect 0 0 1 0;
+#X connect 3 0 2 0;
diff --git a/pd-lib-builder/tests/multiplexx/multiplexx-meta.pd b/pd-lib-builder/tests/multiplexx/multiplexx-meta.pd
new file mode 100644
index 0000000..10132c9
--- /dev/null
+++ b/pd-lib-builder/tests/multiplexx/multiplexx-meta.pd
@@ -0,0 +1,9 @@
+#N canvas 966 322 200 200 10;
+#N canvas 19 51 420 300 META 0;
+#X text 10 10 META this is a prototype of a libdir meta file;
+#X text 10 51 AUTHOR IOhannes m zmolnig;
+#X text 10 110 VERSION 1.0.0;
+#X text 10 90 LICENSE CC0;
+#X text 10 70 DESCRIPTION Example "multiplexx" external.;
+#X text 10 30 NAME multiplexx;
+#X restore 10 10 pd META;
diff --git a/pd-lib-builder/tests/multiplexx/multiplexxA.cpp b/pd-lib-builder/tests/multiplexx/multiplexxA.cpp
new file mode 100644
index 0000000..e18b2f1
--- /dev/null
+++ b/pd-lib-builder/tests/multiplexx/multiplexxA.cpp
@@ -0,0 +1,19 @@
+#include <m_pd.h>
+#include <iostream>
+t_class*multiplexxA_class;
+static void multiplexxA_float(t_object*x, t_float f1) {
+  pd_error(x, "%s got %f", __FUNCTION__, f1);
+}
+static void*multiplexxA_new(void) {
+  return pd_new(multiplexxA_class);
+}
+#if defined(_LANGUAGE_C_PLUS_PLUS) || defined(__cplusplus)
+extern "C" {
+  void multiplexxA_setup(void);
+}
+#endif
+void multiplexxA_setup(void) {
+  std::cerr << __FUNCTION__ << std::endl;
+  multiplexxA_class = class_new(gensym("multiplexxA"), multiplexxA_new, 0, sizeof(t_object), 0, A_NULL);
+  class_addfloat(multiplexxA_class, multiplexxA_float);
+}
diff --git a/pd-lib-builder/tests/multiplexx/multiplexxB.c b/pd-lib-builder/tests/multiplexx/multiplexxB.c
new file mode 100644
index 0000000..41cd95a
--- /dev/null
+++ b/pd-lib-builder/tests/multiplexx/multiplexxB.c
@@ -0,0 +1,13 @@
+#include <m_pd.h>
+t_class*multiplexxB_class;
+static void multiplexxB_float(t_object*x, t_float f1) {
+  pd_error(x, "%s got %f", __FUNCTION__, f1);
+}
+static void*multiplexxB_new(void) {
+  return pd_new(multiplexxB_class);
+}
+void multiplexxB_setup(void) {
+  post("%s", __FUNCTION__);
+  multiplexxB_class = class_new(gensym("multiplexxB"), multiplexxB_new, 0, sizeof(t_object), 0, A_NULL);
+  class_addfloat(multiplexxB_class, multiplexxB_float);
+}
diff --git a/pd-lib-builder/tests/multishared/Makefile b/pd-lib-builder/tests/multishared/Makefile
new file mode 100644
index 0000000..9ccb169
--- /dev/null
+++ b/pd-lib-builder/tests/multishared/Makefile
@@ -0,0 +1,41 @@
+# Makefile to build class 'multishared' for Pure Data.
+# Needs Makefile.pdlibbuilder as helper makefile for platform-dependent build
+# settings and rules.
+
+# library name
+lib.name = multishared
+
+# common functions
+shared.sources = shared.c
+
+# input source file (class name == source file basename)
+class.sources = multisharedA.c multisharedB.c
+
+# all extra files to be included in binary distribution of the library
+datafiles = multishared-help.pd multishared-meta.pd
+
+# include Makefile.pdlibbuilder
+# (for real-world projects see the "Project Management" section
+# in tips-tricks.md)
+PDLIBBUILDER_DIR=../..
+include $(PDLIBBUILDER_DIR)/Makefile.pdlibbuilder
+
+# simplistic tests whether all expected files have been produced/installed
+buildcheck: all
+ifeq ($(shared.extension), $(extension))
+	test -e lib$(lib.name).$(shared.extension)
+else
+	test -e lib$(lib.name).$(extension).$(shared.extension)
+endif
+	test -e multisharedA.$(extension)
+	test -e multisharedB.$(extension)
+installcheck: install
+ifeq ($(shared.extension), $(extension))
+	test -e $(installpath)/lib$(lib.name).$(shared.extension)
+else
+	test -e $(installpath)/lib$(lib.name).$(extension).$(shared.extension)
+endif
+	test -e $(installpath)/multisharedA.$(extension)
+	test -e $(installpath)/multisharedB.$(extension)
+	test -e $(installpath)/multishared-help.pd
+	test -e $(installpath)/multishared-meta.pd
diff --git a/pd-lib-builder/tests/multishared/README.md b/pd-lib-builder/tests/multishared/README.md
new file mode 100644
index 0000000..85bc79b
--- /dev/null
+++ b/pd-lib-builder/tests/multishared/README.md
@@ -0,0 +1,9 @@
+multishared
+===========
+
+minimal pd-lib-builder project that shows how to compile
+a library that contains multiple C-files that are compiled into
+multiple binaries each containing a different Pd-objectclass.
+a local shared library is used for common components.
+
+this is an extended case of the one-object-per-binary library structure.
diff --git a/pd-lib-builder/tests/multishared/multishared-help.pd b/pd-lib-builder/tests/multishared/multishared-help.pd
new file mode 100644
index 0000000..da18aed
--- /dev/null
+++ b/pd-lib-builder/tests/multishared/multishared-help.pd
@@ -0,0 +1,7 @@
+#N canvas 335 160 450 300 12;
+#X msg 143 93 7;
+#X obj 143 125 multisharedA;
+#X obj 223 125 multisharedB;
+#X msg 223 93 12;
+#X connect 0 0 1 0;
+#X connect 3 0 2 0;
diff --git a/pd-lib-builder/tests/multishared/multishared-meta.pd b/pd-lib-builder/tests/multishared/multishared-meta.pd
new file mode 100644
index 0000000..088f750
--- /dev/null
+++ b/pd-lib-builder/tests/multishared/multishared-meta.pd
@@ -0,0 +1,9 @@
+#N canvas 966 322 200 200 10;
+#N canvas 19 51 420 300 META 0;
+#X text 10 10 META this is a prototype of a libdir meta file;
+#X text 10 51 AUTHOR IOhannes m zmolnig;
+#X text 10 110 VERSION 1.0.0;
+#X text 10 90 LICENSE CC0;
+#X text 10 70 DESCRIPTION Example "multishared" external.;
+#X text 10 30 NAME multishared;
+#X restore 10 10 pd META;
diff --git a/pd-lib-builder/tests/multishared/multishared.h b/pd-lib-builder/tests/multishared/multishared.h
new file mode 100644
index 0000000..2e7712a
--- /dev/null
+++ b/pd-lib-builder/tests/multishared/multishared.h
@@ -0,0 +1,3 @@
+#include <m_pd.h>
+
+void multishared_foo(t_float f);
diff --git a/pd-lib-builder/tests/multishared/multisharedA.c b/pd-lib-builder/tests/multishared/multisharedA.c
new file mode 100644
index 0000000..9e8ae57
--- /dev/null
+++ b/pd-lib-builder/tests/multishared/multisharedA.c
@@ -0,0 +1,14 @@
+#include "multishared.h"
+t_class*multisharedA_class;
+static void multisharedA_float(t_object*x, t_float f1) {
+  pd_error(x, "%s got %f", __FUNCTION__, f1);
+  multishared_foo(f1);
+}
+static void*multisharedA_new(void) {
+  return pd_new(multisharedA_class);
+}
+void multisharedA_setup(void) {
+  post("%s", __FUNCTION__);
+  multisharedA_class = class_new(gensym("multisharedA"), multisharedA_new, 0, sizeof(t_object), 0, A_NULL);
+  class_addfloat(multisharedA_class, multisharedA_float);
+}
diff --git a/pd-lib-builder/tests/multishared/multisharedB.c b/pd-lib-builder/tests/multishared/multisharedB.c
new file mode 100644
index 0000000..ca7b669
--- /dev/null
+++ b/pd-lib-builder/tests/multishared/multisharedB.c
@@ -0,0 +1,14 @@
+#include "multishared.h"
+t_class*multisharedB_class;
+static void multisharedB_float(t_object*x, t_float f1) {
+  pd_error(x, "%s got %f", __FUNCTION__, f1);
+  multishared_foo(f1);
+}
+static void*multisharedB_new(void) {
+  return pd_new(multisharedB_class);
+}
+void multisharedB_setup(void) {
+  post("%s", __FUNCTION__);
+  multisharedB_class = class_new(gensym("multisharedB"), multisharedB_new, 0, sizeof(t_object), 0, A_NULL);
+  class_addfloat(multisharedB_class, multisharedB_float);
+}
diff --git a/pd-lib-builder/tests/multishared/shared.c b/pd-lib-builder/tests/multishared/shared.c
new file mode 100644
index 0000000..47284a2
--- /dev/null
+++ b/pd-lib-builder/tests/multishared/shared.c
@@ -0,0 +1,5 @@
+#include "multishared.h"
+
+void multishared_foo(t_float f) {
+  post("%s(%f)", __FUNCTION__, f);
+}
diff --git a/pd-lib-builder/tests/single/Makefile b/pd-lib-builder/tests/single/Makefile
new file mode 100644
index 0000000..0d36005
--- /dev/null
+++ b/pd-lib-builder/tests/single/Makefile
@@ -0,0 +1,24 @@
+# Makefile to build class 'single' for Pure Data.
+# Needs Makefile.pdlibbuilder as helper makefile for platform-dependent build
+# settings and rules.
+
+# library name
+lib.name = single
+
+# input source file (class name == source file basename)
+class.sources = single.c
+
+# all extra files to be included in binary distribution of the library
+datafiles = single-help.pd single-meta.pd
+
+# include Makefile.pdlibbuilder
+# (for real-world projects see the "Project Management" section
+# in tips-tricks.md)
+PDLIBBUILDER_DIR=../..
+include $(PDLIBBUILDER_DIR)/Makefile.pdlibbuilder
+
+# simplistic tests whether all expected files have been produced/installed
+buildcheck: all
+	test -e single.$(extension)
+installcheck: install
+	test -e $(installpath)/single.$(extension)
diff --git a/pd-lib-builder/tests/single/README.md b/pd-lib-builder/tests/single/README.md
new file mode 100644
index 0000000..c752acb
--- /dev/null
+++ b/pd-lib-builder/tests/single/README.md
@@ -0,0 +1,8 @@
+single
+======
+
+minimal pd-lib-builder project that shows how to compile
+a library that contains a single C-file that is compiled into
+a single binary containing a single Pd-objectclass.
+
+this is a degenerate case of the one-object-per-binary library structure.
diff --git a/pd-lib-builder/tests/single/single-help.pd b/pd-lib-builder/tests/single/single-help.pd
new file mode 100644
index 0000000..1d74e5c
--- /dev/null
+++ b/pd-lib-builder/tests/single/single-help.pd
@@ -0,0 +1,4 @@
+#N canvas 335 160 450 300 12;
+#X obj 143 125 single;
+#X msg 143 93 7;
+#X connect 1 0 0 0;
diff --git a/pd-lib-builder/tests/single/single-meta.pd b/pd-lib-builder/tests/single/single-meta.pd
new file mode 100644
index 0000000..57923af
--- /dev/null
+++ b/pd-lib-builder/tests/single/single-meta.pd
@@ -0,0 +1,9 @@
+#N canvas 966 322 200 200 10;
+#N canvas 19 51 420 300 META 0;
+#X text 10 10 META this is a prototype of a libdir meta file;
+#X text 10 51 AUTHOR IOhannes m zmolnig;
+#X text 10 110 VERSION 1.0.0;
+#X text 10 90 LICENSE CC0;
+#X text 10 70 DESCRIPTION Example "single" external.;
+#X text 10 30 NAME single;
+#X restore 10 10 pd META;
diff --git a/pd-lib-builder/tests/single/single.c b/pd-lib-builder/tests/single/single.c
new file mode 100644
index 0000000..a35f10c
--- /dev/null
+++ b/pd-lib-builder/tests/single/single.c
@@ -0,0 +1,13 @@
+#include <m_pd.h>
+t_class*single_class;
+static void single_float(t_object*x, t_float f1) {
+  pd_error(x, "%s got %f", __FUNCTION__, f1);
+}
+static void*single_new(void) {
+  return pd_new(single_class);
+}
+void single_setup(void) {
+  post("%s", __FUNCTION__);
+  single_class = class_new(gensym("single"), single_new, 0, sizeof(t_object), 0, A_NULL);
+  class_addfloat(single_class, single_float);
+}
diff --git a/pd-lib-builder/tests/subdir/Makefile b/pd-lib-builder/tests/subdir/Makefile
new file mode 100644
index 0000000..ac68c2a
--- /dev/null
+++ b/pd-lib-builder/tests/subdir/Makefile
@@ -0,0 +1,27 @@
+# Makefile to build class 'subdir' for Pure Data.
+# Needs Makefile.pdlibbuilder as helper makefile for platform-dependent build
+# settings and rules.
+
+# library name
+lib.name = subdir
+
+# input source file (class name == source file basename)
+class.sources = src/subdir.c src/subdir~.c
+
+# all extra files to be included in binary distribution of the library
+datafiles = subdir-help.pd subdir-meta.pd
+
+# include Makefile.pdlibbuilder
+# (for real-world projects see the "Project Management" section
+# in tips-tricks.md)
+
+PDLIBBUILDER_DIR=../..
+include $(PDLIBBUILDER_DIR)/Makefile.pdlibbuilder
+
+# simplistic tests whether all expected files have been produced/installed
+buildcheck: all
+	test -e subdir.$(extension)
+	test -e subdir~.$(extension)
+installcheck: install
+	test -e $(installpath)/subdir.$(extension)
+	test -e $(installpath)/subdir~.$(extension)
diff --git a/pd-lib-builder/tests/subdir/README.md b/pd-lib-builder/tests/subdir/README.md
new file mode 100644
index 0000000..e5185e5
--- /dev/null
+++ b/pd-lib-builder/tests/subdir/README.md
@@ -0,0 +1,8 @@
+subdir
+======
+
+pd-lib-builder project that shows how to compile
+a library that contains a single C-file in a separate src/ directory,
+that is compiled into a single binary containing a subdir Pd-objectclass.
+
+this is a special case of the one-object-per-binary library structure.
diff --git a/pd-lib-builder/tests/subdir/src/subdir.c b/pd-lib-builder/tests/subdir/src/subdir.c
new file mode 100644
index 0000000..cdcc8ce
--- /dev/null
+++ b/pd-lib-builder/tests/subdir/src/subdir.c
@@ -0,0 +1,13 @@
+#include <m_pd.h>
+t_class*subdir_class;
+static void subdir_float(t_object*x, t_float f1) {
+  pd_error(x, "%s got %f", __FUNCTION__, f1);
+}
+static void*subdir_new(void) {
+  return pd_new(subdir_class);
+}
+void subdir_setup(void) {
+  post("%s", __FUNCTION__);
+  subdir_class = class_new(gensym("subdir"), subdir_new, 0, sizeof(t_object), 0, A_NULL);
+  class_addfloat(subdir_class, subdir_float);
+}
diff --git a/pd-lib-builder/tests/subdir/src/subdir~.c b/pd-lib-builder/tests/subdir/src/subdir~.c
new file mode 100644
index 0000000..ca3ed20
--- /dev/null
+++ b/pd-lib-builder/tests/subdir/src/subdir~.c
@@ -0,0 +1,13 @@
+#include <m_pd.h>
+t_class*subdir_tilde_class;
+static void subdir_tilde_float(t_object*x, t_float f1) {
+  pd_error(x, "%s got %f", __FUNCTION__, f1);
+}
+static void*subdir_tilde_new(void) {
+  return pd_new(subdir_tilde_class);
+}
+void subdir_tilde_setup(void) {
+  post("%s", __FUNCTION__);
+  subdir_tilde_class = class_new(gensym("subdir~"), subdir_tilde_new, 0, sizeof(t_object), 0, A_NULL);
+  class_addfloat(subdir_tilde_class, subdir_tilde_float);
+}
diff --git a/pd-lib-builder/tests/subdir/subdir-help.pd b/pd-lib-builder/tests/subdir/subdir-help.pd
new file mode 100644
index 0000000..725f149
--- /dev/null
+++ b/pd-lib-builder/tests/subdir/subdir-help.pd
@@ -0,0 +1,4 @@
+#N canvas 335 160 450 300 12;
+#X obj 143 125 subdir;
+#X msg 143 93 7;
+#X connect 1 0 0 0;
diff --git a/pd-lib-builder/tests/subdir/subdir-meta.pd b/pd-lib-builder/tests/subdir/subdir-meta.pd
new file mode 100644
index 0000000..3e0b529
--- /dev/null
+++ b/pd-lib-builder/tests/subdir/subdir-meta.pd
@@ -0,0 +1,9 @@
+#N canvas 966 322 200 200 10;
+#N canvas 19 51 420 300 META 0;
+#X text 10 10 META this is a prototype of a libdir meta file;
+#X text 10 51 AUTHOR IOhannes m zmolnig;
+#X text 10 110 VERSION 1.0.0;
+#X text 10 90 LICENSE CC0;
+#X text 10 70 DESCRIPTION Example "subdir" external.;
+#X text 10 30 NAME subdir;
+#X restore 10 10 pd META;
diff --git a/pd-lib-builder/tests/subdir/subdir~-help.pd b/pd-lib-builder/tests/subdir/subdir~-help.pd
new file mode 100644
index 0000000..d3a782b
--- /dev/null
+++ b/pd-lib-builder/tests/subdir/subdir~-help.pd
@@ -0,0 +1,4 @@
+#N canvas 335 160 450 300 12;
+#X obj 143 125 subdir~;
+#X msg 143 93 7;
+#X connect 1 0 0 0;
diff --git a/pd-lib-builder/tests/test-patches.sh b/pd-lib-builder/tests/test-patches.sh
new file mode 100755
index 0000000..0d80177
--- /dev/null
+++ b/pd-lib-builder/tests/test-patches.sh
@@ -0,0 +1,70 @@
+#!/bin/sh
+
+## simple script to open patches via Pd, and check for errors
+## - each patch is opened separately
+## - if an error is encountered, the Pd-printout is displayed
+##   (else it is suppressed)
+## - if any of the patches encountered an error, the script will
+##   exit with a non-0 code
+
+if [ "x${PD}" = "x" ]; then
+  if [ "x${PDBINDIR}" != "x" ]; then
+    for exe in pd.com pd pd.exe; do
+      if [ -x "${PDBINDIR}/${exe}" ]; then
+         PD="${PDBINDIR}/${exe}"
+         break
+      fi
+    done
+    if [ "x${PD}" = "x" ]; then
+      echo "WARNING: couldn't find a usable Pd in '${PDBINDIR}'" 1>&2
+    fi
+  fi
+fi
+if [ "x${PD}" = "x" ]; then
+  PD=pd
+fi
+echo "using Pd: ${PD}"
+
+failed=0
+failed_tests=""
+succeeded=0
+
+open1patch() {
+  logfile=$(mktemp)
+  local patch=$1
+  local patchdir=${patch%%/*}
+  local patchfile=${patch#*/}
+  patchfile=${patchfile#/}
+  #echo "INFO: running ${patchfile} in ${patchdir}"
+  cd "${patchdir}" && \
+  ${PD} -batch -nrt -noprefs -nostdpath -open "${patchfile}" -send "pd quit" \
+	>"${logfile}" 2>&1
+  ret=$?
+  if grep "error: ... couldn't create" "${logfile}" >/dev/null; then
+    ret=1
+  fi
+  if [ "x${ret}" != "x0" ]; then
+    echo ""
+    cat "${logfile}"
+    echo "FAILED[$ret]: ${patch}"
+  else
+    echo "SUCCEEDED: ${patch}"
+  fi
+  rm "${logfile}"
+  return $ret
+}
+
+for p in "${@}"; do
+  if (open1patch "${p}"); then
+    succeeded=$((succeeded+1))
+  else
+    failed=$((failed+1))
+    failed_tests="${failed_tests} ${p}"
+  fi
+done
+
+echo ""
+echo "SUCCESS: ${succeeded}"
+echo "FAILURE: ${failed}"
+test ${failed} -eq 0 || echo "FAILS  :${failed_tests}"
+test ${failed} -eq 0
diff --git a/pd-lib-builder/tips-tricks.md b/pd-lib-builder/tips-tricks.md
index c1795f4..1835687 100644
--- a/pd-lib-builder/tips-tricks.md
+++ b/pd-lib-builder/tips-tricks.md
@@ -3,16 +3,15 @@ pd-lib-builder cheatsheet
 
 # Creating special builds
 
-## cross-compiling on linux x86_64 for other platforms
+## Building for non-native platform
 
-Using pd-lib-builder >=0.6.0 we can define variable `PLATFORM` to specify a 
-target triplet for cross-compilation. Example to build W32 binaries (assuming 
-package `mingw-w64` is installed and a W32 package for Pd is unzipped into a 
-path `${PDWIN32}`:
+Using pd-lib-builder >=0.6.0 we can define variable `PLATFORM` to specify a
+target triplet for cross-compilation. Assuming a W32 package for Pd is unzipped
+into path `${PDWIN32}`, to build for Windows 32 bit:
 
-    make PLATFORM=x86_64-w64-mingw32 PDDIR="${PDWIN32}"
+    make PLATFORM=i686-w64-mingw32 PDDIR="${PDWIN32}"
 
-#### older pd-lib-builder versions
+#### Older pd-lib-builder versions
 
 Using pd-lib-builder < 0.6.0, in the absence of variable `PLATFORM`, you would
 instead override variables `system`, `target.arch`, `CC` and / or `CXX`,
@@ -20,44 +19,66 @@ instead override variables `system`, `target.arch`, `CC` and / or `CXX`,
 
     make system=Windows target.arch=i686 CC=i686-w64-mingw32-gcc STRIP=i686-w64-mingw32-strip PDDIR="${PDWIN32}"
 
-#### toolchains
+#### Toolchains
 
-Cross toolchains for relevant platforms in Debian Buster (install g++ 
-with dependencies for a given platform to get the whole tool chain):
+To build for non-native OS and/or architecture you need a cross toolchain. On
+Linux such toolchains are relatively easy to get. For example Debian Buster
+amd64 provides them for the following platforms (install g++ with dependencies
+for a given platform to get the whole toolchain):
 
 - `arm-linux-gnueabihf`
 - `aarch64-linux-gnu`
 - `i686-linux-gnu`
 - `i686-w64-mingw32` and `x86_64-w64-mingw32` (install `mingw-w64`)
 
-OSX/MacOS cross tool chains are not distributed by Debian. Use project 
-`osxcross` from Thomas Poechtraeger to create the tools.
+Cross toolchains for OSX/MacOS are not generally distributed. Project
+`osxcross` from Thomas Poechtraeger can create them for Linux.
 
-## building double-precision externals
+## Universal binaries on macOS
 
-At the time of writing (2018-02) there is no official Pd that supports
+The compiler, by default, builds for the native architecture of the build
+machine. To make a "universal" multi-arch build, specify the desired
+archtectures on the command line using the "arch" pd-lib-builder Makefile
+variable.
+
+For example, to build a "fat" external for both 64-bit Intel and Arm (Apple
+Silicon):
+
+    make arch="x86_64 arm64"
+
+If the build is successful, the compiled architectures in the built external can
+be confirmed via the `file` command:
+
+~~~sh
+% file vbap.pd_darwin
+vbap.pd_darwin: Mach-O universal binary with 2 architectures: [x86_64:Mach-O 64-bit bundle x86_64] [arm64:Mach-O 64-bit bundle arm64]
+vbap.pd_darwin (for architecture x86_64):   Mach-O 64-bit bundle x86_64
+vbap.pd_darwin (for architecture arm64):    Mach-O 64-bit bundle arm64
+~~~
+
+Note: The available architectures depend on which macOS version & command line
+tools/Xcode combination the build system has. For example, any newer macOS
+10.15+ will support both x86_64 (Intel 64-bit) and arm64 (Apple Silicon) while
+OSX 10.6 - macOS 10.14 can build for x86_64 and i386 (Intel 32-bit).
+
+## Building double-precision externals
+
+At the time of writing (2023-07-06) there is no official Pd that supports
 double-precision numbers yet.
 However, if you do get hold of an experimental double-precision Pd, you can
-easily build your externals for 64-bit numbers:
+easily build your externals for 64-bit numbers, by passing `floatsize=64`
+as an argument to `make`.
+Starting with Pd>=0.54, double precision externals use different extensions
+from traditional (single-precision) externals.
+The extension consists of the OS ("linux", "darwin", "windows"), the CPU
+architecture ("amd64" (x86_64), "i386" (x86), "arm64",...) and the floatsize
+in bits ("64" for double-precision), followed by the system's native extension
+for dynamic libraries (".dll" on Windows, ".so" on macOS/Linux/un*xes).
+As of pd-lib-builder==0.7.0, you have to manually pass this extension:
 
-   make CPPFLAGS="-DPD_FLOATSIZE=64"
-
-## building externals for W64 (64-bit Windows)
-
-At the time of writing (2018-02) there is no official Pd that supports
-W64 yet.
-However, if you do get hold of an experimental W64 Pd, you can
-easily build your externals for this environment with
-
-   make CPPFLAGS="-DPD_LONGINTTYPE=__int64" CC=x86_64-w64-mingw32-gcc
-
-
-To build a double-precision external for W64, use something like:
-
-   make CPPFLAGS="-DPD_LONGINTTYPE=__int64 -DPD_FLOATSIZE=64" CC=x86_64-w64-mingw32-gcc
-
-
-## TODO universal binaries on OSX
+    make floatsize=64 extension=windows-amd64-64.dll
+    make floatsize=64 extension=linux-arm64-64.so
+    make floatsize=64 extension=darwin-fat-64.so arch="x86_64 arm64"
 
 
 # Project management
@@ -97,6 +118,7 @@ In short, `git subtree` is the better `git submodule`.
 So here's how to do it:
 
 #### Initial setup/check-out
+
 This will create a `pd-lib-builder/` directory containing the full history of
 the pd-lib-builder repository up to its release `v0.5.0`
 
@@ -108,6 +130,7 @@ This will automatically merge the `pd-lib-builder/` history into your current
 branch, so everything is ready to go.
 
 #### Cloning your repository with the subtree
+
 Nothing special, really.
 Just clone your repository as always:
 
@@ -116,6 +139,7 @@ git clone https://git.example.org/pd/superbonk~.git
 ~~~
 
 #### Updating the subtree
+
 Time passes and sooner or later you will find, that there is a shiny new
 pd-lib-builder with plenty of bugfixes and new features.
 To update your local copy to pd-lib-builder's current `master`, simply run:
@@ -125,6 +149,7 @@ git subtree pull --prefix pd-lib-builder/ https://github.com/pure-data/pd-lib-bu
 ~~~
 
 #### Pulling the updated subtree into existing clones
+
 Again, nothing special.
 Just pull as always:
 
@@ -132,8 +157,8 @@ Just pull as always:
 git pull
 ~~~
 
-
 #### Further reading
+
 More on the power of `git subtree` can be found online
 - https://medium.com/@v/git-subtrees-a-tutorial-6ff568381844
 - https://www.atlassian.com/blog/git/alternatives-to-git-submodule-git-subtree
@@ -141,8 +166,8 @@ More on the power of `git subtree` can be found online
 
 ### ~~`git submodule`~~ [DISCOURAGED]
 
-
 #### Initial setup/check-out
+
 To add a new submodule to your repository, just run `git submodule add` and
 commit the changes:
 
@@ -169,6 +194,7 @@ git submodule update
 ~~~
 
 #### Updating the submodule
+
 Submodules are usually fixed to a given commit in their repository.
 To update the `pd-lib-builder` submodule to the current `master` do something
 like:
@@ -183,6 +209,7 @@ git commit pd-lib-builder -m "Updated pd-lib-builder to current master"
 ~~~
 
 #### Pulling the updated submodule into existing clones
+
 After you have pushed the submodule updates in your repository, other clones of
 the repository can be updated as follows:
 
@@ -212,6 +239,7 @@ git submodule update
 ~~~
 
 #### Drawbacks
+
 `git submodule` has a number of drawbacks:
 - it requires special commands to synchronize the submodules, in addition to
   synching your repository.
@@ -227,4 +255,3 @@ git submodule update
 
 In general, I would suggest to **avoid** `git submodule`, and instead use the
 better `git subtree` (above).
-