[Distutils] error adding library dirs on commandline

[Pete Shinners]

on running under windows here. whenever i try to add library directories
to build_ext on the commandline i'm getting an error.

File "c:\python\lib\distutils\command\build_ext.py", line 159, in finalize_options
    self.library_dirs.append(os.path.join(sys.exec_prefix, 'libs'))
AttributeError: append

it turns out that library_dirs is a string type. in build_ext.py
line 143 it looks like the code is checking for strings in
self.libraries. from my quick look it would solve the problem to
also check library_dirs also.

also, the commandline help for -L says to pass all library
directories in a semicolon separated list. when i do this the
self.library_dirs is still just a string containing my list with
the semicolons. (it wouldn't seem like this gets split later on?)

using multiple include paths with the semicolons does appear to
work correctly. although i would probably prefer to allow multiple
-I flags. (currently the 'last' -I flag overrides the previous)


am i correct in guessing these commandline arguments aren't used
too often? i'm thinking i'll just parse -I and -L arguments off
of the commandline myself for now. although i'm also seeking 
better advice :]