add git-version-gen script to EXTRA_DIST
diff --git a/openbsc/Makefile.am b/openbsc/Makefile.am
index c4d0aa1..b2522ca 100644
--- a/openbsc/Makefile.am
+++ b/openbsc/Makefile.am
@@ -7,6 +7,7 @@
 pkgconfig_DATA = openbsc.pc
 
 BUILT_SOURCES = $(top_srcdir)/.version
+EXTRA_DIST = git-version-gen
 $(top_srcdir)/.version:
 	echo $(VERSION) > $@-t && mv $@-t $@
 dist-hook: