kc3-lang/libtommath

diff --git a/makefile b/makefile
index a6f7690..4e05020 100644
--- a/makefile
+++ b/makefile
@@ -118,11 +118,12 @@ pretty:
 
 .PHONY: pre_gen
 pre_gen:
+	mkdir -p pre_gen
 	perl gen.pl
 	sed -e 's/[[:blank:]]*$$//' mpi.c > pre_gen/mpi.c
 	rm mpi.c
 
-zipup: clean pre_gen new_file manual poster docs
+zipup: clean new_file manual poster docs
 	@# Update the index, so diff-index won't fail in case the pdf has been created.
 	@#   As the pdf creation modifies the tex files, git sometimes detects the
 	@#   modified files, but misses that it's put back to its original version.
@@ -135,6 +136,7 @@ zipup: clean pre_gen new_file manual poster docs
 	-@(find libtommath-$(VERSION)/ -type f | xargs grep 'FIXM[E]') && echo '############## BEWARE: the "fixme" marker was found !!! ##############' || true
 	mkdir -p libtommath-$(VERSION)/doc
 	cp doc/bn.pdf doc/tommath.pdf doc/poster.pdf libtommath-$(VERSION)/doc/
+	$(MAKE) -C libtommath-$(VERSION)/ pre_gen
 	tar -c libtommath-$(VERSION)/ | xz -6e -c - > ltm-$(VERSION).tar.xz
 	zip -9rq ltm-$(VERSION).zip libtommath-$(VERSION)
 	rm -rf libtommath-$(VERSION)