nixpkgs/pkgs/development/libraries/flatpak/validate-icon-pixbuf.patch

diff --git a/icon-validator/validate-icon.c b/icon-validator/validate-icon.c
index 9e885070..44fea035 100644
--- a/icon-validator/validate-icon.c
+++ b/icon-validator/validate-icon.c
@@ -200,6 +200,8 @@ rerun_in_sandbox (const char *arg_width,
     add_args (args, "--setenv", "G_MESSAGES_DEBUG", g_getenv ("G_MESSAGES_DEBUG"), NULL);
   if (g_getenv ("G_MESSAGES_PREFIXED"))
     add_args (args, "--setenv", "G_MESSAGES_PREFIXED", g_getenv ("G_MESSAGES_PREFIXED"), NULL);
+  if (g_getenv ("GDK_PIXBUF_MODULE_FILE"))
+    add_args (args, "--setenv", "GDK_PIXBUF_MODULE_FILE", g_getenv ("GDK_PIXBUF_MODULE_FILE"), NULL);
 
   add_args (args, validate_icon, arg_width, arg_height, filename, NULL);
   g_ptr_array_add (args, NULL);