* tool/ytab.sed: fix for Bison 2.6.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@36533 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 6 insertions, 0 deletions

diff --git a/tool/ytab.sed b/tool/ytab.sed
index f956c065e2..46317db284 100755
--- a/tool/ytab.sed
+++ b/tool/ytab.sed
@@ -5,6 +5,12 @@ i\
 a\
 #endif
 }
+/^extern int yydebug;/{
+i\
+#ifndef yydebug
+a\
+#endif
+}
 /^yydestruct.*yymsg/,/#endif/{
   /^yydestruct/{
     /parser/!{