I'm installing ros on a gentoo box, following these wiki instructions:
http://www.ros.org/wiki/cturtle/Installation/Gentoo

this command fails after download:
rosinstall /opt/ros
"https://code.ros.org/cgi-bin/gen_rosinstall.py?rosdistro=cturtle&variant=ros_only&overlay=no"

here the error:

[rosmake-2] Starting >>> test_roscpp_serialization [ make ]
[ rosmake ] Last 40 linesswig: 11.9 sec ] [ rosou... [ 4 Active 28/72 Complete ]
{-------------------------------------------------------------------------------
  sed: file ./confstatY2pQjG/subs-4.sed line 3: unterminated `s' command
  config.status: creating Examples/test-suite/guilescm/Makefile
  sed: file ./confstatY2pQjG/subs-4.sed line 3: unterminated `s' command
  config.status: creating Examples/test-suite/java/Makefile
  sed: file ./confstatY2pQjG/subs-4.sed line 3: unterminated `s' command
  config.status: creating Examples/test-suite/mzscheme/Makefile
  sed: file ./confstatY2pQjG/subs-4.sed line 3: unterminated `s' command
  config.status: creating Examples/test-suite/ocaml/Makefile
  sed: file ./confstatY2pQjG/subs-4.sed line 3: unterminated `s' command
  config.status: creating Examples/test-suite/perl5/Makefile
  sed: file ./confstatY2pQjG/subs-4.sed line 3: unterminated `s' command
  config.status: creating Examples/test-suite/php4/Makefile
  sed: file ./confstatY2pQjG/subs-4.sed line 3: unterminated `s' command
  config.status: creating Examples/test-suite/pike/Makefile
  sed: file ./confstatY2pQjG/subs-4.sed line 3: unterminated `s' command
  config.status: creating Examples/test-suite/python/Makefile
  sed: file ./confstatY2pQjG/subs-4.sed line 3: unterminated `s' command
  config.status: creating Examples/test-suite/ruby/Makefile
  sed: file ./confstatY2pQjG/subs-4.sed line 3: unterminated `s' command
  config.status: creating Examples/test-suite/tcl/Makefile
  sed: file ./confstatY2pQjG/subs-4.sed line 3: unterminated `s' command
  config.status: creating Examples/test-suite/lua/Makefile
  sed: file ./confstatY2pQjG/subs-4.sed line 3: unterminated `s' command
  config.status: creating Examples/test-suite/allegrocl/Makefile
  sed: file ./confstatY2pQjG/subs-4.sed line 3: unterminated `s' command
  config.status: creating Examples/test-suite/clisp/Makefile
  sed: file ./confstatY2pQjG/subs-4.sed line 3: unterminated `s' command
  config.status: creating Examples/test-suite/cffi/Makefile
  sed: file ./confstatY2pQjG/subs-4.sed line 3: unterminated `s' command
  config.status: creating Examples/test-suite/uffi/Makefile
  sed: file ./confstatY2pQjG/subs-4.sed line 3: unterminated `s' command
  config.status: creating preinst-swig
  sed: file ./confstatY2pQjG/subs-4.sed line 3: unterminated `s' command
  config.status: creating Source/Include/swigconfig.h
  config.status: Source/Include/swigconfig.h is unchanged
  config.status: executing depfiles commands
  make[1]: Entering directory `/opt/ros/ros/3rdparty/wxswig/build/SWIG-1.3.29'
  make[1]: *** No targets.  Stop.
  make[1]: Leaving directory `/opt/ros/ros/3rdparty/wxswig/build/SWIG-1.3.29'
-------------------------------------------------------------------------------}
[ rosmake ] Output from build of package wxswig written to:
[ rosmake ]    /root/.ros/rosmake/rosmake_output-20101223-135645/wxswig/build_output.log
[rosmake-3] Finished <<< wxswig [FAIL] [ 11.94 seconds ]
[ rosmake ] Halting due to failure in package wxswig.
[ rosmake ] Waiting for other threads to complete.
[rosmake-0] Finished <<< test_roscpp_serialization_perf [PASS] [ 6.68 seconds ]
[rosmake-1] Finished <<< rosout [PASS] [ 8.72 seconds ]
[rosmake-2] Finished <<< test_roscpp_serialization [PASS] [ 15.96 seconds ]
[ rosmake ] Results:
[ rosmake ] Built 32 packages with 1 failures.
[ rosmake ] Summary output to directory
[ rosmake ] /root/.ros/rosmake/rosmake_output-20101223-135645
rosinstall operating on /opt/ros from specifications in rosinstall
files  /opt/ros/.rosinstall,
https://code.ros.org/cgi-bin/gen_rosinstall.py?rosdistro=cturtle&variant=ros_only&overlay=no
Installing https://code.ros.org/svn/ros/stacks/ros/tags/ros-1.2.4  to
/opt/ros/ros
Installing https://code.ros.org/svn/ros/stacks/ros_comm/tags/ros_comm-0.0.1
 to /opt/ros/ros_comm
Installing https://code.ros.org/svn/ros/stacks/ros_tutorials/tags/ros_tutorials-0.2.3
 to /opt/ros/ros_tutorials
Bootstrapping ROS build
Traceback (most recent call last):
  File "/usr/bin/rosinstall", line 5, in <module>
    pkg_resources.run_script('rosinstall==0.5.9', 'rosinstall')
  File "/usr/lib64/python2.6/site-packages/pkg_resources.py", line
468, in run_script
    self.require(requires)[0].run_script(script_name, ns)
  File "/usr/lib64/python2.6/site-packages/pkg_resources.py", line
1201, in run_script
    execfile(script_filename, namespace, namespace)
  File "/usr/lib64/python2.6/site-packages/rosinstall-0.5.9-py2.6.egg/EGG-INFO/scripts/rosinstall",
line 506, in <module>
    sys.exit(not rosinstall_main(sys.argv))
  File "/usr/lib64/python2.6/site-packages/rosinstall-0.5.9-py2.6.egg/EGG-INFO/scripts/rosinstall",
line 497, in rosinstall_main
    subprocess.check_call("source %s && rosmake ros --rosdep-install"
% (os.path.join(options.path, 'setup.sh')), shell=True,
executable='/bin/bash')
  File "/usr/lib64/python2.6/subprocess.py", line 488, in check_call
    raise CalledProcessError(retcode, cmd)
subprocess.CalledProcessError: Command 'source /opt/ros/setup.sh &&
rosmake ros --rosdep-install' returned non-zero exit status 1
^C
[1]+  Exit 1                  nohup rosinstall /opt/ros
"https://code.ros.org/cgi-bin/gen_rosinstall.py?rosdistro=cturtle&variant=ros_only&overlay=no"
> ros.txt 2>&1