Index: b/gen-project/Makefile.am
===================================================================
--- a/gen-project/Makefile.am
+++ b/gen-project/Makefile.am
@@ -28,6 +28,7 @@
 vala_gen_project_LDADD = \
 	./libgen-project/libgen-project.la
 	$(GENPROJECT_LIBS) \
+	-lm \
 	$(NULL)
 
 EXTRA_DIST = \
