Index: build/prep.sh
==================================================================
--- build/prep.sh
+++ build/prep.sh
@@ -17,10 +17,11 @@
 for file in config.guess config.sub install-sh; do
 	rm -f "${file}"
 done
 
 aclocal -I aclocal
+autoheader
 autoconf
 automake -fca
 
 rm -rf autom4te.cache