1 files changed, 2 insertions, 0 deletions
diff --git a/parser.l b/parser.l
index 1fa7ac38..a49e43d5 100644
--- a/parser.l
+++ b/parser.l
@@ -71,6 +71,7 @@ val form_to_ln_hash;
 
 static val prepared_error_message;
 
+#ifdef FLEX_MAJOR_VERSION
 #define FLEX_NUM_VERSION 1000*FLEX_MAJOR_VERSION + \
                          100*FLEX_MINOR_VERSION + \
                          FLEX_SUBMINOR_VERSION
@@ -81,6 +82,7 @@ int yylex_destroy(void)
   return 0;
 }
 #endif
+#endif
 
 void yyerror(const char *s)
 {