This patch makes GTK+ look for additional modules in a list of directories
specified by the environment variable "GUIX_GTK3_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	2015-09-20 20:09:05.060590217 +0200
+++ b/gtk/gtkmodules.c	2015-09-20 20:10:33.423124833 +0200
@@ -52,6 +52,7 @@
 get_module_path (void)
 {
   const gchar *module_path_env;
+  const gchar *module_guix_gtk3_path_env;
   const gchar *exe_prefix;
   gchar *module_path;
   gchar *default_dir;
@@ -61,6 +62,7 @@
     return result;
 
   module_path_env = g_getenv ("GTK_PATH");
+  module_guix_gtk3_path_env = g_getenv ("GUIX_GTK3_PATH");
   exe_prefix = g_getenv ("GTK_EXE_PREFIX");
 
   if (exe_prefix)
@@ -68,7 +70,13 @@
   else
     default_dir = g_build_filename (_gtk_get_libdir (), "gtk-3.0", NULL);
 
-  if (module_path_env)
+  if (module_guix_gtk3_path_env && module_path_env)
+    module_path = g_build_path (G_SEARCHPATH_SEPARATOR_S,
+				module_guix_gtk3_path_env, module_path_env, default_dir, NULL);
+  else if (module_guix_gtk3_path_env)
+    module_path = g_build_path (G_SEARCHPATH_SEPARATOR_S,
+				module_guix_gtk3_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
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<tr><td><span title='2024-11-22 21:57:43 +0000'>2024-11-22</span></td><td><a href='/guix/commit/gnu/packages/ruby.scm?id=eabdad1ad5144487a1606fb35afa11c1bb6dc720'>gnu: ruby-net-smtp: Fix tests.</a><span class='msg-avail'>...<span class='msg-tooltip'>The tests where failing due to the SSL certificate being used expired.
Regenerate the certificate running the check phase.

* gnu/packages/ruby.scm (ruby-net-smtp): Fix check phase.

Change-Id: I8bd72f2e929f496996f6fd88b13a4d95837273da
</span></span></td><td>Javier Olaechea</td></tr>
<tr><td><span title='2024-11-03 19:23:55 +0800'>2024-11-03</span></td><td><a href='/guix/commit/gnu/packages/ruby.scm?id=79670e4bc6afb02d9a16d31e10ca4a31cbefff4f'>gnu: ruby-ethon: Fix libcurl detection at runtime.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/ruby.scm (ruby-ethon)[arguments]&lt;#:phases&gt;: Add phase
'libcurl-use-absolute-reference.
</span></span></td><td>Nicolas Graves</td></tr>