guix/gnu/packages/patches/gtk4-respect-GUIX_GTK4_PATH.patch

From 889294a93fc6464c2c2919bc47f6fd85ec823363 Mon Sep 17 00:00:00 2001
From: Raghav Gururajan <rg@raghavgururajan.name>
Date: Tue, 18 May 2021 19:57:00 -0400
Subject: [PATCH] [PATCH]: Honor GUIX_GTK4_PATH.

This patch makes GTK look for additional modules in a list of directories
specified by the environment variable "GUIX_GTK4_PATH". This can be used
instead of "GTK_PATH" to make GTK find modules that are incompatible with
other major versions of GTK.
---
 gtk/gtkmodules.c | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/gtk/gtkmodules.c b/gtk/gtkmodules.c
index aace5dcbc9..193b6a02e9 100644
--- a/gtk/gtkmodules.c
+++ b/gtk/gtkmodules.c
@@ -105,6 +105,7 @@ static char **
 get_module_path (void)
 {
   const char *module_path_env;
+  const gchar *module_guix_gtk4_path_env;
   const char *exe_prefix;
   char *module_path;
   char *default_dir;
@@ -114,6 +115,7 @@ get_module_path (void)
     return result;
 
   module_path_env = g_getenv ("GTK_PATH");
+  module_guix_gtk4_path_env = g_getenv ("GUIX_GTK4_PATH");
   exe_prefix = g_getenv ("GTK_EXE_PREFIX");
 
   if (exe_prefix)
@@ -121,7 +123,13 @@ get_module_path (void)
   else
     default_dir = g_build_filename (_gtk_get_libdir (), "gtk-4.0", NULL);
 
-  if (module_path_env)
+  if (module_guix_gtk4_path_env && module_path_env)
+    module_path = g_build_path (G_SEARCHPATH_SEPARATOR_S,
+				module_guix_gtk4_path_env, module_path_env, default_dir, NULL);
+  else if (module_guix_gtk4_path_env)
+    module_path = g_build_path (G_SEARCHPATH_SEPARATOR_S,
+				module_guix_gtk4_path_env, default_dir, NULL);
+  else if (module_path_env)
     module_path = g_build_path (G_SEARCHPATH_SEPARATOR_S,
 				module_path_env, default_dir, NULL);
   else
-- 
2.31.1