1 files changed, 11 insertions, 0 deletions
diff --git a/parser.l b/parser.l
index 15e7958b..1fa7ac38 100644
--- a/parser.l
+++ b/parser.l
@@ -71,6 +71,17 @@ val form_to_ln_hash;
 
 static val prepared_error_message;
 
+#define FLEX_NUM_VERSION 1000*FLEX_MAJOR_VERSION + \
+                         100*FLEX_MINOR_VERSION + \
+                         FLEX_SUBMINOR_VERSION
+
+#if FLEX_NUM_VERSION < 20509
+int yylex_destroy(void)
+{
+  return 0;
+}
+#endif
+
 void yyerror(const char *s)
 {
   yyerrorf(lit("~a"), string_utf8(s), nao);