pythonPackages.gcovr: Fix build

pkgs/development/python-modules/gcovr/default.nix

@@ -1,6 +1,7 @@
 { stdenv
 , buildPythonPackage
 , fetchPypi
+, jinja2
 }:
 
 buildPythonPackage rec {
@@ -12,6 +13,15 @@ buildPythonPackage rec {
     sha256 = "ca94c337f2d9a70db177ec4330534fad7b2b772beda625c1ec071fbcf1361e22";
   };
 
+  propagatedBuildInputs = [
+    jinja2
+  ];
+
+  # There are no unit tests in the pypi tarball. Most of the unit tests on the
+  # github repository currently only work with gcc5, so we just disable them.
+  # See also: https://github.com/gcovr/gcovr/issues/206
+  doCheck = false;
+
   meta = with stdenv.lib; {
     description = "A Python script for summarizing gcov data";
     license = licenses.bsd0;