mingw 8.1.3 build error: conftest.c: Permission denied

While running the following postgresql-base-8.1.3 configure cmdline in mingw:

./configure --enable-thread-safety --prefix=/cgrid/local/postgresql
--without-zlib

I get the following error(s):

[...]
checking for waitpid... no
checking for wcstombs... yes
checking whether fdatasync is declared... no
checking for struct sockaddr_in6... ./configure: line 13792: conftest.c:
Permission denied
./configure: line 13795: conftest.c: Permission denied
./configure: line 13796: conftest.c: Permission denied
sed: can't read conftest.c: Permission denied
rm: cannot remove `conftest.c': Permission denied
no
checking for PS_STRINGS... ./configure: line 13861: conftest.c: Permission
denied
./configure: line 13864: conftest.c: Permission denied
./configure: line 13865: conftest.c: Permission denied
sed: can't read conftest.c: Permission denied
rm: cannot remove `conftest.c': Permission denied
no
checking whether snprintf is declared... ./configure: line 14177:
conftest.c: Permission denied
./configure: line 14180: conftest.c: Permission denied
./configure: line 14181: conftest.c: Permission denied
sed: can't read conftest.c: Permission denied
rm: cannot remove `conftest.c': Permission denied
no
[...]

And more like them.

Any ideas? Should this be cause for concern? The script just continues; I
killed it before proceeding.

Could the fact that /cgrid/local/postgresql does not exist have something
to do with this? Maybe the --without-zlib?

More details:

$ uname -a
MINGW32_NT-5.1 MATTS-LAPTOP 1.0.11(0.46/3/2) 2004-04-30 18:55 i686 unknown

mengland(at)MATTS-LAPTOP
/e/data.online/data.cleversafe/svnwork/swdev-external-src/postgresql/dist/mingw/postgresql-8.1.3
$ g++ --version
g++.exe (GCC) 3.4.4 (mingw special)
Copyright (C) 2004 Free Software Foundation, Inc.
This is free software; see the source for copying conditions. There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

-Matt