Code review comment for lp:~ubuntu-mate-dev/indicators-gtk2/indicator-application-gtk2

This fails to build for me:

Making check in tests
make[2]: Entering directory '/tmp/buildd/indicator-application-gtk2-12.10.0.1/tests'
make test-approver
make[3]: Entering directory '/tmp/buildd/indicator-application-gtk2-12.10.0.1/tests'
  CC test_approver-gen-notification-approver.xml.o
  CC test_approver-test-approver.o
  CCLD test-approver
make[3]: Leaving directory '/tmp/buildd/indicator-application-gtk2-12.10.0.1/tests'
make check-TESTS
make[3]: Entering directory '/tmp/buildd/indicator-application-gtk2-12.10.0.1/tests'
DBus daemon: unix:abstract=/tmp/dbus-8rW6Cf2ODE,guid=4525cf8249ee98d9f403ae6454ddd61f
Approver: Started with PID: 11659
Service : Started with PID: 11661
No protocol specified

(test-approver:11659): Gtk-WARNING **: cannot open display: :0
Approver: Exited with status 256
Approver: Shutting down
Service: Shutting down
DBus daemon: Shutdown
FAIL: test-approver-tester
==================================
1 of 1 test failed
Please report to <email address hidden>
==================================
Makefile:439: recipe for target 'check-TESTS' failed
make[3]: *** [check-TESTS] Error 1
make[3]: Leaving directory '/tmp/buildd/indicator-application-gtk2-12.10.0.1/tests'
Makefile:562: recipe for target 'check-am' failed
make[2]: *** [check-am] Error 2
make[2]: Leaving directory '/tmp/buildd/indicator-application-gtk2-12.10.0.1/tests'
Makefile:356: recipe for target 'check-recursive' failed
make[1]: *** [check-recursive] Error 1