--- /dev/null
+--- fuseiso-20070708/src/fuseiso.c.orig 2021-04-12 18:00:05.513973615 +0200
++++ fuseiso-20070708/src/fuseiso.c 2021-04-12 18:00:48.777114350 +0200
+@@ -309,7 +309,7 @@
+ maintain_mtab = 1;
+ iocharset = NULL;
+
+- char c;
++ signed char c;
+ while((c = getopt(argc, argv, "+npc:h")) > 0) {
+ switch(c) {
+ case 'n':