see https://sourceforge.net/p/ziproxy/bugs/37/
fix c23 https://bugs.gentoo.org/943947
--- a/src/image.c
+++ b/src/image.c
@@ -1216,7 +1216,7 @@ int jpg2bitmap(char *inbuf, int insize,
 	return IMG_RET_OK;
 }
 
-static boolean jpeg_dest_empty_output_buffer()
+static boolean jpeg_dest_empty_output_buffer(struct jpeg_compress_struct *)
 {
 		return FALSE; //output file larger than original..
 }