wmc: Allow building without debug support in the parser.
diff --git a/tools/wmc/wmc.c b/tools/wmc/wmc.c
index 858606f..4dd9889 100644
--- a/tools/wmc/wmc.c
+++ b/tools/wmc/wmc.c
@@ -113,6 +113,8 @@
 char *cmdline;			/* The entire commandline */
 time_t now;			/* The time of start of wmc */
 
+int yydebug;
+
 int getopt (int argc, char *const *argv, const char *optstring);
 static void segvhandler(int sig);