https://src.fedoraproject.org/rpms/libcuefile/blob/7dd8752f5aa2dccbaccb4c28a23f659df3bc0d19/f/libcuefile-fedora-c99.patch
https://bugs.gentoo.org/871588
--- a/src/cue_parse.c
+++ b/src/cue_parse.c
@@ -1513,6 +1513,8 @@ void yyerror (char *s)
 	fprintf(stderr, "%d: %s\n", cue_lineno, s);
 }
 
+void cue_delete_buffer(void);
+
 Cd *cue_parse (FILE *fp)
 {
 	cue_yyin = fp;