https://bugs.gentoo.org/927336
https://savannah.gnu.org/bugs/?63720

From 509906e7cc4669b525cbcb05022e7e10c6663627 Mon Sep 17 00:00:00 2001
From: Nikita Popov <npopov@redhat.com>
Date: Fri, 27 Jan 2023 12:13:10 +0100
Subject: [PATCH] Fix C99 support in sffile.c

This fixes one -Wimplicit-function-declaration and one
-Wimplicit-int warning, which will become errors in future
compiler versions.

Related to:

  <https://fedoraproject.org/wiki/Changes/PortingToModernC>
  <https://fedoraproject.org/wiki/Toolchain/PortingToModernC>
--- a/libs/libsffile/sffile.c
+++ b/libs/libsffile/sffile.c
@@ -20,6 +20,7 @@
  *================================================================*/
 //Interface to Denemo License:  FSF GPL version 3 or later
 
+#include <ctype.h>
 #include <stdio.h>
 #include <string.h>
 #include <stdlib.h>
@@ -51,7 +52,7 @@ static void ConvertIllegalChar(char *name){
 int  ParseSoundfont(char *soundfont, int index, char **name, int *preset, int *bank) {
   FILE *fp;
   static SFInfo sf;
-  static initialized = FALSE;
+  static int initialized = FALSE;
   int i;
   int number = 0;
   if(soundfont) {
-- 
2.39.1