https://bugs.python.org/issue12619

--- Lib/plat-aix4/regen
+++ Lib/plat-aix4/regen
@@ -5,4 +5,4 @@
         exit 1;;
 esac
 set -v
-h2py.py -i '(u_long)' /usr/include/netinet/in.h
+python$EXE ../../Tools/scripts/h2py.py -i '(u_long)' /usr/include/netinet/in.h
--- Lib/plat-linux2/regen
+++ Lib/plat-linux2/regen
@@ -5,4 +5,4 @@
 	exit 1;;
 esac
 set -v
-h2py -i '(u_long)' /usr/include/sys/types.h /usr/include/netinet/in.h /usr/include/dlfcn.h
+python$EXE ../../Tools/scripts/h2py.py -i '(u_long)' /usr/include/sys/types.h /usr/include/netinet/in.h /usr/include/dlfcn.h /usr/include/linux/cdrom.h
--- Lib/plat-sunos5/regen
+++ Lib/plat-sunos5/regen
@@ -5,5 +5,4 @@
 	exit 1;;
 esac
 set -v
-h2py -i '(u_long)' /usr/include/sys/types.h /usr/include/netinet/in.h /usr/include/sys/stropts.h /usr/include/dlfcn.h
-
+python$EXE ../../Tools/scripts/h2py.py -i '(u_long)' /usr/include/sys/types.h /usr/include/netinet/in.h /usr/include/sys/stropts.h /usr/include/dlfcn.h
--- Lib/plat-unixware7/regen
+++ Lib/plat-unixware7/regen
@@ -5,5 +5,5 @@
 	exit 1;;
 esac
 set -v
-h2py -i '(u_long)' /usr/include/netinet/in.h
-h2py /usr/include/sys/stropts.h
+python$EXE ../../Tools/scripts/h2py.py -i '(u_long)' /usr/include/netinet/in.h
+python$EXE ../../Tools/scripts/h2py.py /usr/include/sys/stropts.h
--- Makefile.pre.in
+++ Makefile.pre.in
@@ -430,7 +430,7 @@
 
 # Default target
 all:		build_all
-build_all:	$(BUILDPYTHON) oldsharedmods sharedmods gdbhooks
+build_all:	$(BUILDPYTHON) oldsharedmods sharedmods platformspecificmods gdbhooks
 
 # Compile a binary with profile guided optimization.
 profile-opt:
@@ -548,6 +548,32 @@
 		_TCLTK_INCLUDES='$(TCLTK_INCLUDES)' _TCLTK_LIBS='$(TCLTK_LIBS)' \
 		$(PYTHON_FOR_BUILD) $(srcdir)/setup.py $$quiet build
 
+# Build the platform-specific modules
+platformspecificmods: $(BUILDPYTHON) sharedmods
+	@PLATDIR=$(PLATDIR); \
+	if test ! -f $(srcdir)/Lib/$(PLATDIR)/regen; then \
+		$(INSTALL) -d $(srcdir)/Lib/$(PLATDIR); \
+		if test -f $(srcdir)/Lib/$${PLATDIR%?}/regen; then \
+			cp $(srcdir)/Lib/$${PLATDIR%?}/regen $(srcdir)/Lib/$(PLATDIR)/regen; \
+		else \
+			cp $(srcdir)/Lib/plat-generic/regen $(srcdir)/Lib/$(PLATDIR)/regen; \
+		fi \
+	fi
+	@EXE="$(BUILDEXE)"; export EXE; \
+	PATH="`pwd`:$$PATH"; export PATH; \
+	PYTHONPATH="$(srcdir)/Lib:$(abs_builddir)/`cat pybuilddir.txt`"; export PYTHONPATH; \
+	if [ -n "$(MULTIARCH)" ]; then MULTIARCH=$(MULTIARCH); export MULTIARCH; fi; \
+	if [ "$(build)" = "$(host)" ]; then \
+	  PYTHON_FOR_BUILD="$(BUILDPYTHON)"; \
+	else \
+	  PYTHON_FOR_BUILD="$(PYTHON_FOR_BUILD)"; \
+	fi; export PYTHON_FOR_BUILD; \
+	cd $(srcdir)/Lib/$(PLATDIR); \
+	$(RUNSHARED) ./regen || exit 1; \
+	for module in *.py; do \
+		$(RUNSHARED) $(BUILDPYTHON) -c "with open('$$module', 'rb') as module: compile(module.read(), '$$module', 'exec')" || exit 1; \
+	done
+
 # Build static library
 # avoid long command lines, same as LIBRARY_OBJS
 $(LIBRARY): $(LIBRARY_OBJS)
@@ -1085,7 +1111,7 @@
 		unittest unittest/test \
 		lib-old \
 		curses pydoc_data $(MACHDEPS)
-libinstall:	build_all $(srcdir)/Lib/$(PLATDIR) $(srcdir)/Modules/xxmodule.c
+libinstall:	build_all $(srcdir)/Modules/xxmodule.c
 	@for i in $(SCRIPTDIR) $(LIBDEST); \
 	do \
 		if test ! -d $(DESTDIR)$$i; then \
@@ -1168,23 +1194,6 @@
 	-PYTHONPATH=$(DESTDIR)$(LIBDEST) $(RUNSHARED) \
 		$(PYTHON_FOR_BUILD) -m lib2to3.pgen2.driver $(DESTDIR)$(LIBDEST)/lib2to3/PatternGrammar.txt
 
-# Create the PLATDIR source directory, if one wasn't distributed..
-$(srcdir)/Lib/$(PLATDIR):
-	mkdir $(srcdir)/Lib/$(PLATDIR)
-	cp $(srcdir)/Lib/plat-generic/regen $(srcdir)/Lib/$(PLATDIR)/regen
-	export PATH; PATH="`pwd`:$$PATH"; \
-	export PYTHONPATH; PYTHONPATH="$(srcdir)/Lib:$(abs_builddir)/`cat pybuilddir.txt`"; \
-	export DYLD_FRAMEWORK_PATH; DYLD_FRAMEWORK_PATH="`pwd`"; \
-	export EXE; EXE="$(BUILDEXE)"; \
-	if [ -n "$(MULTIARCH)" ]; then export MULTIARCH; MULTIARCH=$(MULTIARCH); fi; \
-	export PYTHON_FOR_BUILD; \
-	if [ "$(build)" = "$(host)" ]; then \
-	  PYTHON_FOR_BUILD="$(BUILDPYTHON)"; \
-	else \
-	  PYTHON_FOR_BUILD="$(PYTHON_FOR_BUILD)"; \
-	fi; \
-	cd $(srcdir)/Lib/$(PLATDIR); $(RUNSHARED) ./regen
-
 python-config: $(srcdir)/Misc/python-config.in
 	# Substitution happens here, as the completely-expanded BINDIR
 	# is not available in configure
@@ -1481,7 +1490,7 @@
 Python/thread.o: @THREADHEADERS@
 
 # Declare targets that aren't real files
-.PHONY: all build_all sharedmods oldsharedmods test quicktest memtest
+.PHONY: all build_all sharedmods oldsharedmods platformspecificmods test quicktest memtest
 .PHONY: install altinstall oldsharedinstall bininstall altbininstall
 .PHONY: maninstall libinstall inclinstall libainstall sharedinstall
 .PHONY: frameworkinstall frameworkinstallframework frameworkinstallstructure