libt2ngroup_%.P : Makefile.am
echo $@ : $($*_GROUP) > libt2ngroup_$*.P
-%.libt2nstamp : libt2ngroup_%.P $(LIBT2N_CODEGEN)
+%.libt2nstamp : libt2ngroup_%.P
# assuming we have some unix like shell (maybe even bash)
# echo BUILT_SOURCES: $(BUILT_SOURCES)
# temporarily create _common.hxx file (will be overwritten by codegen below)