We have a rather peculiar software distribution system here at work. I downloaded, packaged, and installed astroid, logilab-common, and pylint. When I run pylint now (1.1.0 worked just fine), I get this error:

Traceback (most recent call last):
  File "/opt/local/bin/pylint", line 6, in <module>
    from pkg_resources import load_entry_point
  File "/home/skipm/.local/lib/python2.7/site-packages/pkg_resources.py", line 2805, in <module>
    working_set.require(__requires__)
  File "/home/skipm/.local/lib/python2.7/site-packages/pkg_resources.py", line 696, in require
    needed = self.resolve(parse_requirements(requirements))
  File "/home/skipm/.local/lib/python2.7/site-packages/pkg_resources.py", line 594, in resolve
    raise DistributionNotFound(req)
pkg_resources.DistributionNotFound: pylint==1.4.0

I see the (I think) necessary pylint bits in our site-packages directory:

% ls -ld /opt/local/lib/python2.7/site-packages/pylint*
drwxr-xr-x 6 root root 4096 Nov 25 14:43 /opt/local/lib/python2.7/site-packages/pylint
drwxr-xr-x 2 root root 4096 Nov 25 14:43 /opt/local/lib/python2.7/site-packages/pylint-1.4.0-py2.7.egg-info

and they seem to have reasonable contents:

% ls -lL /opt/local/lib/python2.7/site-packages/pylint
total 324
-rw-rw-r-- 1 root root  1458 Nov 15 12:18 __init__.py
-rw-rw-r-- 1 root root  1838 Nov 25 14:42 __init__.pyc
-rw-rw-r-- 1 root root    56 Nov 15 12:18 __main__.py
-rw-rw-r-- 1 root root   226 Nov 25 14:42 __main__.pyc
-rw-rw-r-- 1 root root  2925 Nov 23 03:03 __pkginfo__.py
-rw-rw-r-- 1 root root  2439 Nov 25 14:42 __pkginfo__.pyc
drwxr-xr-x 2 root root  4096 Nov 25 14:43 checkers
-rw-rw-r-- 1 root root  5782 Nov 21 05:23 config.py
-rw-rw-r-- 1 root root  5407 Nov 25 14:42 config.pyc
-rw-rw-r-- 1 root root  6445 Nov 15 12:18 epylint.py
-rw-rw-r-- 1 root root  5848 Nov 25 14:42 epylint.pyc
-rw-rw-r-- 1 root root 19401 Nov 21 05:23 gui.py
-rw-rw-r-- 1 root root 18419 Nov 25 14:42 gui.pyc
-rw-rw-r-- 1 root root  2828 Nov 15 12:18 interfaces.py
-rw-rw-r-- 1 root root  4143 Nov 25 14:42 interfaces.pyc
-rw-rw-r-- 1 root root 57390 Nov 23 02:46 lint.py
-rw-rw-r-- 1 root root 49003 Nov 25 14:42 lint.pyc
drwxr-xr-x 2 root root  4096 Nov 25 14:43 pyreverse
drwxr-xr-x 2 root root  4096 Nov 25 14:43 reporters
drwxr-xr-x 7 root root  4096 Nov 25 14:43 test
-rw-rw-r-- 1 root root 13371 Nov 21 05:23 testutils.py
-rw-rw-r-- 1 root root 36111 Nov 21 05:23 utils.py
-rw-rw-r-- 1 root root 34047 Nov 25 14:42 utils.pyc
blade% ls -lL /opt/local/lib/python2.7/site-packages/pylint-1.4.0-py2.7.egg-info/
total 44
-rw-rw-r-- 1 root root  3227 Nov 25 14:42 PKG-INFO
-rw-rw-r-- 1 root root 22242 Nov 25 14:42 SOURCES.txt
-rw-rw-r-- 1 root root     1 Nov 25 14:42 dependency_links.txt
-rw-rw-r-- 1 root root   172 Nov 25 14:42 entry_points.txt
-rw-rw-r-- 1 root root    45 Nov 25 14:42 requires.txt
-rw-rw-r-- 1 root root     7 Nov 25 14:42 top_level.txt

The whole distutils/setuptools/pkg_resources stuff has always eluded my understanding. Can someone give me some suggestions about what's missing?

Thanks,

Skip Montanaro