X-Git-Url: https://git.saurik.com/bison.git/blobdiff_plain/6b4cb804b5fe6b4e2f087babab809c2b790d2b89..10b009fa50359e2dd5b068f1aaa40c1497da916a:/data/c.m4

diff --git a/data/c.m4 b/data/c.m4
index ccb4969e..fd2203eb 100644
--- a/data/c.m4
+++ b/data/c.m4
@@ -30,7 +30,7 @@ m4_define([b4_tocpp],
 # ------------------
 # A valid C macro name to use as a CPP header guard for FILE.
 m4_define([b4_cpp_guard],
-[b4_tocpp(m4_defn([b4_prefix])/[$1])])
+[[YY_]b4_tocpp(m4_defn([b4_prefix])/[$1])[_INCLUDED]])
 
 
 # b4_cpp_guard_open(FILE)