git-remote-bzr is provided by new enough git
https://bugs.gentoo.org/show_bug.cgi?id=477096
--- setup.py.orig       2013-07-16 18:34:17.074836269 +0000
+++ setup.py    2013-07-16 18:34:24.807892339 +0000
@@ -30,7 +30,7 @@
           package_dir={'bzrlib.plugins.git':'.'},
           packages=['bzrlib.plugins.git',
                     'bzrlib.plugins.git.tests'],
-          scripts=['bzr-receive-pack', 'bzr-upload-pack', 'git-remote-bzr'],
+          scripts=['bzr-receive-pack', 'bzr-upload-pack'],
           classifiers=[
               'Topic :: Software Development :: Version Control',
               'Environment :: Plugins',