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); /form>