1 files changed, 9 insertions, 4 deletions
diff --git a/perly.c b/perly.c
index c83a932977..0f1b7a88f9 100644
--- a/perly.c
+++ b/perly.c
@@ -27,6 +27,13 @@
 
 #include "EXTERN.h"
 #define PERL_IN_PERLY_C
+
+#ifdef DEBUGGING
+#  define YYDEBUG 1
+#else
+#  define YYDEBUG 0
+#endif
+
 #include "perl.h"
 
 typedef unsigned char yytype_uint8;
@@ -38,10 +45,8 @@ typedef signed char yysigned_char;
 /* YYINITDEPTH -- initial size of the parser's stacks.  */
 #define YYINITDEPTH 200
 
-#ifdef DEBUGGING
-#  define YYDEBUG 1
-#else
-#  define YYDEBUG 0
+#ifndef YY_NULL
+# define YY_NULL 0
 #endif
 
 /* contains all the parser state tables; auto-generated from perly.y */