--- grammar/lexer.l.orig	2018-08-26 22:03:25 UTC
+++ grammar/lexer.l
@@ -97,7 +97,7 @@ extern int yydebug;
 /* somehow, I need these prototype even though the headers are 
  * included. I guess that's some autotools magic I don't understand...
  */
-#if !defined(__FreeBSD__)
+#if !defined(__FreeBSD__) && !defined(__BSDSUniX__)
 int fileno(FILE *stream);
 #endif