Create a private sugar lib and put our extensions there.

lib/python/Makefile.am

@@ -0,0 +1,33 @@
+INCLUDES =				\
+	$(PYTHON_INCLUDES)		\
+	$(PYGTK_CFLAGS)			\
+	$(LIB_CFLAGS)			\
+	-I $(top_srcdir)/lib/src
+
+pkgpyexecdir = $(pythondir)
+
+pkgpyexec_LTLIBRARIES = _sugar.la
+
+_sugar_la_LDFLAGS = -module -avoid-version -R$(MOZILLA_HOME)
+_sugar_la_LIBADD =					\
+	$(LIB_LIBS)					\
+	$(top_builddir)/lib/src/libsugarprivate.la
+
+_sugar_la_SOURCES = 		\
+	_sugarmodule.c
+
+nodist__sugar_la_SOURCES = _sugar.c
+
+_sugar.c: _sugar.defs _sugar.override
+
+CLEANFILES = _sugar.c
+EXTRA_DIST = _sugar.override _sugar.defs
+
+.defs.c:
+	(cd $(srcdir)\
+	 && $(PYGTK_CODEGEN) \
+	    --register $(GNOMEPYTHONEXTRAS_DEFSDIR)/gtkmozembed.defs \
+	    --override $*.override \
+	    --prefix py$* $*.defs) > gen-$*.c \
+	&& cp gen-$*.c $*.c \
+	&& rm -f gen-$*.c