Introduce the UNINSTALLED_GLIB_BUILDDIR environment variable

This makes it possible to also use relative imports for
gdbus-codegen's config module.

https://bugzilla.gnome.org/show_bug.cgi?id=650763

gio/gdbus-2.0/codegen/__init__.py

@@ -0,0 +1,29 @@
+# -*- Mode: Python -*-
+
+# GDBus - GLib D-Bus Library
+#
+# Copyright (C) 2008-2011 Red Hat, Inc.
+#
+# This library is free software; you can redistribute it and/or
+# modify it under the terms of the GNU Lesser General Public
+# License as published by the Free Software Foundation; either
+# version 2 of the License, or (at your option) any later version.
+#
+# This library is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+# Lesser General Public License for more details.
+#
+# You should have received a copy of the GNU Lesser General
+# Public License along with this library; if not, write to the
+# Free Software Foundation, Inc., 59 Temple Place, Suite 330,
+# Boston, MA 02111-1307, USA.
+#
+# Author: David Zeuthen <davidz@redhat.com>
+
+import os
+
+builddir = os.environ.get('UNINSTALLED_GLIB_BUILDDIR')
+
+if builddir is not None:
+    __path__.append(os.path.abspath(os.path.join(builddir, 'gio', 'gdbus-2.0', 'codegen')))

gio/gdbus-2.0/codegen/codegen.py

@@ -23,7 +23,7 @@
 
 import sys
 
-import config
+from . import config
 from . import utils
 from . import dbustypes
 

gio/gdbus-2.0/codegen/codegen_docbook.py

@@ -24,7 +24,7 @@
 import sys
 import re
 
-import config
+from . import config
 from . import utils
 from . import dbustypes
 from . import parser

gio/gdbus-2.0/codegen/codegen_main.py

@@ -24,7 +24,7 @@
 import sys
 import optparse
 
-import config
+from . import config
 from . import utils
 from . import dbustypes
 from . import parser