This patch makes GTK+ look for additional modules in a list of directories
specified by the environment variable "GUIX_GTK2_PATH".  This can be used
instead of "GTK_PATH" to make GTK+ find modules that are incompatible with
other major versions of GTK+.

--- a/gtk/gtkmodules.c	2014-09-29 22:02:17.000000000 +0200
+++ b/gtk/gtkmodules.c	2015-12-02 18:41:53.306396938 +0100
@@ -55,6 +55,7 @@
 get_module_path (void)
 {
   const gchar *module_path_env;
+  const gchar *module_guix_gtk2_path_env;
   const gchar *exe_prefix;
   const gchar *home_dir;
   gchar *home_gtk_dir = NULL;
@@ -70,6 +71,7 @@
     home_gtk_dir = g_build_filename (home_dir, ".gtk-2.0", NULL);
 
   module_path_env = g_getenv ("GTK_PATH");
+  module_guix_gtk2_path_env = g_getenv ("GUIX_GTK2_PATH");
   exe_prefix = g_getenv ("GTK_EXE_PREFIX");
 
   if (exe_prefix)
@@ -77,9 +79,21 @@
   else
     default_dir = g_build_filename (GTK_LIBDIR, "gtk-2.0", NULL);
 
-  if (module_path_env && home_gtk_dir)
+  if (module_guix_gtk2_path_env && module_path_env && home_gtk_dir)
+    module_path = g_build_path (G_SEARCHPATH_SEPARATOR_S,
+				module_guix_gtk2_path_env, module_path_env, home_gtk_dir, default_dir, NULL);
+  else if (module_guix_gtk2_path_env && home_gtk_dir)
+    module_path = g_build_path (G_SEARCHPATH_SEPARATOR_S,
+				module_guix_gtk2_path_env, home_gtk_dir, default_dir, NULL);
+  else if (module_guix_gtk2_path_env && module_path_env)
+    module_path = g_build_path (G_SEARCHPATH_SEPARATOR_S,
+				module_guix_gtk2_path_env, module_path_env, default_dir, NULL);
+  else if (module_path_env && home_gtk_dir)
     module_path = g_build_path (G_SEARCHPATH_SEPARATOR_S,
 				module_path_env, home_gtk_dir, default_dir, NULL);
+  else if (module_guix_gtk2_path_env)
+    module_path = g_build_path (G_SEARCHPATH_SEPARATOR_S,
+				module_guix_gtk2_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);
ble>
<div class='path'>path: <a href='/guix/log/?id=d41e9ce19478143883c2c81d9d1bbac6d4e6760a'>root</a>/<a href='/guix/log/gnu?id=d41e9ce19478143883c2c81d9d1bbac6d4e6760a'>gnu</a>/<a href='/guix/log/gnu/packages?id=d41e9ce19478143883c2c81d9d1bbac6d4e6760a'>packages</a>/<a href='/guix/log/gnu/packages/wine.scm?id=d41e9ce19478143883c2c81d9d1bbac6d4e6760a'>wine.scm</a></div><div class='content'><table class='list nowrap'><tr class='nohover'><th class='left'>Age</th><th class='left'>Commit message (<a href='/guix/log/gnu/packages/wine.scm?id=d41e9ce19478143883c2c81d9d1bbac6d4e6760a&amp;showmsg=1'>Expand</a>)</th><th class='left'>Author</th></tr>
<tr><td><span title='2024-09-02 22:31:10 +0200'>2024-09-02</span></td><td><a href='/guix/commit/gnu/packages/wine.scm?id=a751c59304e0f62a02c4fa87fbcbec888ed16853'>gnu: wine64: Fix build.</a><span class='msg-avail'>...<span class='msg-tooltip'>With the core-updates merge, the handling of modify-phases makes the current
ordering a hard error.  Make it so that phases are read from top to bottom.

* gnu/packages/wine.scm (wine64)[#:phases]: Move ‘copy-wine32-binaries’
and ‘copy-wine32-libraries’ before conditional ‘wrap-executable’.
&lt;copy-wine32-manpage&gt;: Use “.zst” instead of “.gz” as file ending.
</span></span></td><td>Liliana Marie Prikler</td></tr>