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-rw-r--r--crawl-ref/source/util/levcomp.ypp2
1 files changed, 2 insertions, 0 deletions
diff --git a/crawl-ref/source/util/levcomp.ypp b/crawl-ref/source/util/levcomp.ypp
index b6ee732330..aeccfb8aa2 100644
--- a/crawl-ref/source/util/levcomp.ypp
+++ b/crawl-ref/source/util/levcomp.ypp
@@ -6,6 +6,8 @@
#include "stuff.h"
#include <map>
+#define YYERROR_VERBOSE 1
+
int yylex();
extern int yylineno;