Index: src/recognize.c
--- src/recognize.c.orig
+++ src/recognize.c
@@ -29,7 +29,7 @@ Foundation, Inc., 51 Franklin Street, Fifth Floor, Bos
 #include "recognize.h"
 
 /* preprocess.c */
-int prep_examined;
+extern int prep_examined;
 
 void engine_prep(void);