diff --git a/devel/libexplain/files/patch-codegen-gram.y b/devel/libexplain/files/patch-codegen-gram.y
new file mode 100644
index 000000000000..3096d73ad850
--- /dev/null
+++ b/devel/libexplain/files/patch-codegen-gram.y
@@ -0,0 +1,10 @@
+--- codegen/gram.y.orig	2012-11-20 06:20:24.000000000 +0100
++++ codegen/gram.y	2013-02-28 17:27:14.000000000 +0100
+@@ -258,7 +258,6 @@
+ }
+ 
+ 
+-static int yyparse(void);
+ static node_t *result;
+ #if YYDEBUG
+ extern int yydebug;