$ emerge -Dv iotop

These are the packages that would be merged, in order:

Calculating dependencies... done!
[ebuild   R   ] sys-process/iotop-0.2.1  0 kB

Total: 1 package (1 reinstall), Size of downloads: 0 kB


>>> Verifying ebuild manifests

>>> Emerging (1 of 1) sys-process/iotop-0.2.1
 * iotop-0.2.1.tar.bz2 RMD160 SHA1 SHA256 size ;-) ...                                                           [ ok ]
 * checking ebuild checksums ;-) ...                                                                             [ ok ]
 * checking auxfile checksums ;-) ...                                                                            [ ok ]
 * checking miscfile checksums ;-) ...                                                                           [ ok ]
 * Determining the location of the kernel source code
 * Found kernel source directory:
 *     /usr/src/linux
 * Found kernel object directory:
 *     /lib/modules/2.6.32.2/build
 * Found sources for kernel version:
 *     2.6.32.2
 * Checking for suitable kernel configuration options...                                                          [ ok ]
>>> Unpacking source...
>>> Unpacking iotop-0.2.1.tar.bz2 to /var/tmp/portage/sys-process/iotop-0.2.1/work
>>> Source unpacked in /var/tmp/portage/sys-process/iotop-0.2.1/work
>>> Preparing source in /var/tmp/portage/sys-process/iotop-0.2.1/work/iotop-0.2.1 ...
>>> Source prepared.
>>> Configuring source in /var/tmp/portage/sys-process/iotop-0.2.1/work/iotop-0.2.1 ...
>>> Source configured.
>>> Compiling source in /var/tmp/portage/sys-process/iotop-0.2.1/work/iotop-0.2.1 ...
python2.6 setup.py build
setuptools-0.6c6-py2.4.egg/setuptools/command/sdist.py:3: UserWarning: Module pkg_resources was already imported from setuptools-0.6c6-py2.4.egg/pkg_resources.py, but /usr/lib64/python2.6/site-packages is being added to sys.path
setuptools-0.6c6-py2.4.egg/setuptools/command/sdist.py:3: UserWarning: Module setuptools was already imported from setuptools-0.6c6-py2.4.egg/setuptools/__init__.py, but /usr/lib64/python2.6/site-packages is being added to sys.path
setuptools-0.6c6-py2.4.egg/setuptools/command/sdist.py:3: UserWarning: Module site was already imported from /usr/lib64/python2.6/site.pyc, but /usr/lib64/python2.6/site-packages is being added to sys.path
Traceback (most recent call last):
  File "setup.py", line 22, in <module>
    license='GPL'
  File "/usr/lib64/python2.6/distutils/core.py", line 113, in setup
    _setup_distribution = dist = klass(attrs)
  File "setuptools-0.6c6-py2.4.egg/setuptools/dist.py", line 223, in __init__
  File "/usr/lib64/python2.6/distutils/dist.py", line 270, in __init__
    self.finalize_options()
  File "setuptools-0.6c6-py2.4.egg/setuptools/dist.py", line 256, in finalize_options
  File "setuptools-0.6c6-py2.4.egg/pkg_resources.py", line 1917, in load
    # remove trailing zeros from each series of numeric parts
ImportError: <module 'setuptools.dist' from 'setuptools-0.6c6-py2.4.egg/setuptools/dist.py'> has no 'check_packages' attribute
 * 
 * ERROR: sys-process/iotop-0.2.1 failed.
 * Call stack:
 *               ebuild.sh, line   49:  Called src_compile
 *             environment, line 4362:  Called distutils_src_compile
 *             environment, line 1164:  Called die
 * The specific snippet of code:
 *           "$(PYTHON -A)" setup.py "${DISTUTILS_GLOBAL_OPTIONS[@]}" build "$@" || die "Building failed";
 *  The die message:
 *   Building failed
 * 
 * If you need support, post the topmost build error, and the call stack if relevant.
 * A complete build log is located at '/var/tmp/portage/sys-process/iotop-0.2.1/temp/build.log'.
 * The ebuild environment file is located at '/var/tmp/portage/sys-process/iotop-0.2.1/temp/environment'.
 * 

>>> Failed to emerge sys-process/iotop-0.2.1, Log file:

>>>  '/var/tmp/portage/sys-process/iotop-0.2.1/temp/build.log'