debian/python_gi_init.patch

--- a/__init__.py	1969-12-31 16:00:00.000000000 -0800
+++ b/__init__.py	2018-10-17 21:45:04.908201161 -0700
@@ -29,6 +29,22 @@ import os
 import importlib
 import types
 
+_base = os.path.dirname(os.path.dirname(__file__))
+os.environ['GI_TYPELIB_PATH'] = os.path.join(_base, 'usr', 'lib',
+                                             'x86_64-linux-gnu',
+                                             'girepository-1.0')
+
+# Tell fontconfig where to find the sandboxed font files.
+os.environ["FONTCONFIG_PATH"] = os.path.join(_base, "etc/fonts/")
+os.environ["FONTCONFIG_FILE"] = os.path.join(_base, "etc/fonts/fonts.conf")
+# The sysroot here needs to be "/". If it were _base, then the font caches
+# would contain _base-relative paths in them. Unfortunately pango interprets
+# those as absolute paths and ends up failing to find all fonts.
+os.environ["FONTCONFIG_SYSROOT"] = "/"
+os.environ["GDK_PIXBUF_MODULEDIR"] = os.path.join(_base, "rpathed", "usr", "lib", "x86_64-linux-gnu", "gdk-pixbuf-2.0", "2.10.0", "loaders")
+os.environ["GDK_PIXBUF_MODULE_FILE"] = os.path.join(os.environ["GDK_PIXBUF_MODULEDIR"], "loaders.cache")
+os.system(os.path.join(_base, "usr/lib/x86_64-linux-gnu/gdk-pixbuf-2.0/gdk-pixbuf-query-loaders") + " --update-cache")
+
 _static_binding_error = ('When using gi.repository you must not import static '
                          'modules like "gobject". Please change all occurrences '
                          'of "import gobject" to "from gi.repository import GObject". '