lxsession: fix build with gcc 14 (#368711)

Author: misuzu

pkgs/desktops/lxde/core/lxsession/default.nix

@@ -1,6 +1,7 @@
 {
   lib,
   stdenv,
+  fetchpatch,
   fetchFromGitHub,
   autoconf,
   automake,
@@ -28,7 +29,17 @@ stdenv.mkDerivation rec {
     sha256 = "17sqsx57ymrimm5jfmcyrp7b0nzi41bcvpxsqckmwbhl19g6c17d";
   };
 
-  patches = [ ./xmlcatalog_patch.patch ];
+  patches = [
+    ./xmlcatalog_patch.patch
+
+    # lxsession compilation is broken upstream as of GCC 14
+    # https://sourceforge.net/p/lxde/bugs/973/
+    (fetchpatch {
+      name = "0001-Fix-build-on-GCC-14.patch";
+      url = "https://sourceforge.net/p/lxde/bugs/973/attachment/0001-Fix-build-on-GCC-14.patch";
+      hash = "sha256-lxF3HZy5uLK7Cfu8W1A03syZf7OWXpHiU2Fk+xBl39g=";
+    })
+  ];
 
   nativeBuildInputs = [
     autoconf