From e2b74824d75c763e49fe3ef555a18dfe797e0a56 Mon Sep 17 00:00:00 2001
From: Ruben Maher <r@rkm.id.au>
Date: Thu, 2 Feb 2017 23:31:36 +1030
Subject: [PATCH] gnome-tweak-tool: trick autoconf into using python2

---
 .../gnome-3/3.22/misc/gnome-tweak-tool/default.nix       | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/pkgs/desktops/gnome-3/3.22/misc/gnome-tweak-tool/default.nix b/pkgs/desktops/gnome-3/3.22/misc/gnome-tweak-tool/default.nix
index e6c4b8c8202..f75cdd0e83e 100644
--- a/pkgs/desktops/gnome-3/3.22/misc/gnome-tweak-tool/default.nix
+++ b/pkgs/desktops/gnome-3/3.22/misc/gnome-tweak-tool/default.nix
@@ -12,6 +12,15 @@ in stdenv.mkDerivation rec {
 
   propagatedUserEnvPkgs = [ gnome3.gnome_themes_standard ];
 
+  # Make sure that Python 2 is first in $PATH because gnome3.gnome_shell
+  # propagates python3Packages.python.  If we do not do this, autoconf will use
+  # Python 3 instead which gnome-tweak-tool does not support at this time.  See:
+  # https://github.com/NixOS/nixpkgs/issues/21851
+  # https://github.com/NixOS/nixpkgs/pull/22370
+  preConfigure = ''
+    PATH="${python}/bin:$PATH"
+  '';
+
   makeFlags = [ "DESTDIR=/" ];
 
   buildInputs = [ pkgconfig gtk3 glib intltool itstool libxml2