traceback while installing

[Sabin Iacob]

iacobs at moria ~/tmp/bzr.dev $ sudo ./setup.py install
running install
running build
running build_py
running build_ext
building 'bzrlib._dirstate_helpers_c' extension
Traceback (most recent call last):
  File "./setup.py", line 344, in <module>
    setup(**ARGS)
  File "/usr/lib/python2.5/distutils/core.py", line 151, in setup
    dist.run_commands()
  File "/usr/lib/python2.5/distutils/dist.py", line 974, in run_commands
    self.run_command(cmd)
  File "/usr/lib/python2.5/distutils/dist.py", line 994, in run_command
    cmd_obj.run()
  File "/usr/lib/python2.5/distutils/command/install.py", line 506, in run
    self.run_command('build')
  File "/usr/lib/python2.5/distutils/cmd.py", line 333, in run_command
    self.distribution.run_command(command)
  File "/usr/lib/python2.5/distutils/dist.py", line 994, in run_command
    cmd_obj.run()
  File "./setup.py", line 142, in run
    build.run(self)
  File "/usr/lib/python2.5/distutils/command/build.py", line 112, in run
    self.run_command(cmd_name)
  File "/usr/lib/python2.5/distutils/cmd.py", line 333, in run_command
    self.distribution.run_command(command)
  File "/usr/lib/python2.5/distutils/dist.py", line 994, in run_command
    cmd_obj.run()
  File "./setup.py", line 178, in run
    build_ext.run(self)
  File "/usr/lib/python2.5/distutils/command/build_ext.py", line 290, in run
    self.build_extensions()
  File "/usr/lib/python2.5/site-packages/Pyrex/Distutils/build_ext.py",
line 82, in build_extensions
    self.build_extension(ext)
  File "./setup.py", line 186, in build_extension
    build_ext.build_extension(self, ext)
  File "/usr/lib/python2.5/distutils/command/build_ext.py", line 481, in
build_extension
    depends=ext.depends)
  File "/usr/lib/python2.5/distutils/ccompiler.py", line 689, in compile
    depends, extra_postargs)
  File "/usr/lib/python2.5/distutils/ccompiler.py", line 371, in
_setup_compile
    output_dir=outdir)
  File "/usr/lib/python2.5/distutils/ccompiler.py", line 980, in
object_filenames
    for src_name in source_filenames:
TypeError: 'NoneType' object is not iterable


bzr trunk r3170, clean branch; could it be some package that I need to
update?