https://bugs.gentoo.org/951622
https://github.com/gpac/gpac/commit/8d7cac0bf9f9775cae1d43de7138206758f28b0c
--- a/src/filters/ff_mx.c
+++ b/src/filters/ff_mx.c
@@ -248,5 +248,5 @@
 
 
-#if (LIBAVFORMAT_VERSION_MAJOR <= 59)
+#if (LIBAVFORMAT_VERSION_MAJOR < 61)
 static int ffavio_write_packet(void *opaque, uint8_t *buf, int buf_size)
 #else