ctypes can't find files in /usr/local/lib?

Long time Python use, new to ctypes (by way of a module I'm trying).

This is Ubuntu 9.04, Python 2.6

I have some libraries in /usr/local/lib.

ldconfig -p|grep libname:

libownet-2.7.so.38 (libc6) => /usr/local/lib/libownet-2.7.so.38
libowcapi-2.7.so.38 (libc6) => /usr/local/lib/libowcapi-2.7.so.38
libow-2.7.so.38 (libc6) => /usr/local/lib/libow-2.7.so.38

There is a libname.so symlink to each file.

verifies that the cache knows about them.

However, when I try to load them in ctypes, I get:

>>> ctypes.cdll.LoadLibrary ("libownet.so")
Traceback (most recent call last):
  File "<input>", line 1, in <module>
  File "/usr/lib/python2.6/ctypes/__init__.py", line 431, in LoadLibrary
    return self._dlltype(name)
  File "/usr/lib/python2.6/ctypes/__init__.py", line 353, in __init__
    self._handle = _dlopen(self._name, mode)
OSError: libownet.so: cannot open shared object file: No such file or
directory

This library loads just fine when I copy it all to /usr/lib, run 
ldconfig,
and then run the above LoadLibrary command:

/usr/local/lib# cp -av libow* /usr/lib
`libow-2.7.so.38' -> `/usr/lib/libow-2.7.so.38'
`libow-2.7.so.38.0.0' -> `/usr/lib/libow-2.7.so.38.0.0'
`libowcapi-2.7.so.38' -> `/usr/lib/libowcapi-2.7.so.38'
`libowcapi-2.7.so.38.0.0' -> `/usr/lib/libowcapi-2.7.so.38.0.0'
`libowcapi.la' -> `/usr/lib/libowcapi.la'
`libowcapi.so' -> `/usr/lib/libowcapi.so'
`libow.la' -> `/usr/lib/libow.la'
`libownet-2.7.so.38' -> `/usr/lib/libownet-2.7.so.38'
`libownet-2.7.so.38.0.0' -> `/usr/lib/libownet-2.7.so.38.0.0'
`libownet.la' -> `/usr/lib/libownet.la'
`libownet.so' -> `/usr/lib/libownet.so'
`libow.so' -> `/usr/lib/libow.so'

# ls -l /usr/lib/libow*
lrwxrwxrwx 1 root root      19 2010-09-16 
21:29 /usr/lib/libow-2.7.so.38 ->
libow-2.7.so.38.0.0
-rwxr-xr-x 1 root root 2927322 2010-07-08 
21:27 /usr/lib/libow-2.7.so.38.0.0
lrwxrwxrwx 1 root root      23 2010-09-16
21:29 /usr/lib/libowcapi-2.7.so.38 -> libowcapi-2.7.so.38.0.0
-rwxr-xr-x 1 root root   31314 2010-07-08
21:27 /usr/lib/libowcapi-2.7.so.38.0.0
-rwxr-xr-x 1 root root    1084 2010-07-08 21:27 /usr/lib/libowcapi.la
lrwxrwxrwx 1 root root      23 2010-09-16 21:29 /usr/lib/libowcapi.so ->
libowcapi-2.7.so.38.0.0
-rwxr-xr-x 1 root root     985 2010-07-08 21:27 /usr/lib/libow.la
lrwxrwxrwx 1 root root      22 2010-09-16
21:29 /usr/lib/libownet-2.7.so.38 -> libownet-2.7.so.38.0.0
-rwxr-xr-x 1 root root  131818 2010-07-08
21:27 /usr/lib/libownet-2.7.so.38.0.0
-rwxr-xr-x 1 root root     973 2010-07-08 21:27 /usr/lib/libownet.la
lrwxrwxrwx 1 root root      22 2010-09-16 21:29 /usr/lib/libownet.so ->
libownet-2.7.so.38.0.0
lrwxrwxrwx 1 root root      19 2010-09-16 21:29 /usr/lib/libow.so ->
libow-2.7.so.38.0.0

# ldconfig

>>> ctypes.cdll.LoadLibrary ("libowcapi.so")
<CDLL 'libowcapi.so', handle 9ddcc58 at 9e1386c>

Another data point, if I do a symlink:

/usr/lib/libowcapi.so -> /usr/local/lib/libowcapi.so

And run ldconfig, I can then load it with ctypes.

Oh, and an strace of the python process shows that it never tries 
anything in /usr/local/lib.

Any ideas?

j

-- 
Joshua J. Kugler - Fairbanks, Alaska
Azariah Enterprises - Programming and Website Design
[email protected] - Jabber: [email protected]
PGP Key: http://pgp.mit.edu/  ID 0x73B13B6A

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