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I don't have a way of testing your patch and will have to
apply it on blind faith.  Be sure to get it right and read
it carefully to make sure it doesn't mess-up anyone else's
compilation.

The attached version won't compile for me (MSVC++ 6.0 on WinMe):

posixmodule.c
C:\py24\Modules\posixmodule.c(1175) : warning C4013:
'ttyname' undefined; assuming extern returning int
C:\py24\Modules\posixmodule.c(1175) : warning C4047: '=' :
'char *' differs in levels of indirection from 'int '
C:\py24\Modules\posixmodule.c(1660) : error C2065: 'DIR' :
undeclared identifier
C:\py24\Modules\posixmodule.c(1660) : error C2065: 'dirp' :
undeclared identifier
C:\py24\Modules\posixmodule.c(1660) : warning C4552: '*' :
operator has no effect; expected operator with side-effect
C:\py24\Modules\posixmodule.c(1661) : error C2143: syntax
error : missing ';' before 'type'
C:\py24\Modules\posixmodule.c(1662) : error C2143: syntax
error : missing ';' before 'type'
C:\py24\Modules\posixmodule.c(1665) : error C2065:
'arg_is_unicode' : undeclared identifier
C:\py24\Modules\posixmodule.c(1670) : warning C4013:
'opendir' undefined; assuming extern returning int
C:\py24\Modules\posixmodule.c(1670) : warning C4047: '==' :
'int ' differs in levels of indirection from 'void *'
C:\py24\Modules\posixmodule.c(1674) : warning C4013:
'closedir' undefined; assuming extern returning int
C:\py24\Modules\posixmodule.c(1678) : error C2065: 'ep' :
undeclared identifier
C:\py24\Modules\posixmodule.c(1678) : warning C4013:
'readdir' undefined; assuming extern returning int
C:\py24\Modules\posixmodule.c(1678) : warning C4047: '!=' :
'int ' differs in levels of indirection from 'void *'
C:\py24\Modules\posixmodule.c(1679) : error C2223: left of
'->d_name' must point to struct/union
C:\py24\Modules\posixmodule.c(1680) : error C2223: left of
'->d_namlen' must point to struct/union
C:\py24\Modules\posixmodule.c(1681) : error C2223: left of
'->d_name' must point to struct/union
C:\py24\Modules\posixmodule.c(1681) : error C2223: left of
'->d_namlen' must point to struct/union
C:\py24\Modules\posixmodule.c(1683) : error C2223: left of
'->d_name' must point to struct/union
C:\py24\Modules\posixmodule.c(1683) : error C2223: left of
'->d_namlen' must point to struct/union
C:\py24\Modules\posixmodule.c(1683) : error C2198:
'PyString_FromStringAndSize' : too few actual parameters
C:\py24\Modules\posixmodule.c(2860) : warning C4013: 'fork'
undefined; assuming extern returning int
C:\py24\Modules\posixmodule.c(2986) : warning C4013:
'getegid' undefined; assuming extern returning int
C:\py24\Modules\posixmodule.c(2999) : warning C4013:
'geteuid' undefined; assuming extern returning int
C:\py24\Modules\posixmodule.c(3012) : warning C4013:
'getgid' undefined; assuming extern returning int
C:\py24\Modules\posixmodule.c(3134) : warning C4013:
'getppid' undefined; assuming extern returning int
C:\py24\Modules\posixmodule.c(3176) : warning C4013:
'getuid' undefined; assuming extern returning int
C:\py24\Modules\posixmodule.c(3206) : warning C4013: 'kill'
undefined; assuming extern returning int
C:\py24\Modules\posixmodule.c(4959) : warning C4013: 'wait'
undefined; assuming extern returning int