https://bugs.gentoo.org/875404
https://github.com/mate-desktop/engrampa/pull/477

From f54425f1f994fc235c6cdd4013eb9fcf17da9f29 Mon Sep 17 00:00:00 2001
From: Florian Weimer <fweimer@redhat.com>
Date: Fri, 14 Apr 2023 22:35:08 +0200
Subject: [PATCH] file-utils: Include <strings.h> for strcasecmp

The _XOPEN_SOURCE macro definition overrides _DEFAULT_SOURCE
and disables the declaration in <string.h>.

This avoids an implicit function declaration and build failures
with future compilers.
--- a/src/file-utils.c
+++ b/src/file-utils.c
@@ -27,6 +27,7 @@
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
+#include <strings.h>
 #include <ctype.h>
 #include <time.h>
 #include <unistd.h>