[Stackless] Stackless 3.0 and above won't configure on OS X

[Geoff Hill]

When building from source on OS X, the configure script does not fully  
complete. The following error comes up:

[MacBook Pro] python-3.0.1 $ ./configure --prefix=/usr/local/stackless  
--enable-stacklessfewerregisters CC=gcc-4.2 CXX=g++-4.2
checking for --with-universal-archs... 32-bit
checking MACHDEP... darwin
checking machine type as reported by uname -m... i386
...
checking for broken mbstowcs... no
checking for build directories... done
configure: creating ./config.status
sed: 1: "s/.*%!_!# !%!_!#  _%!_! ...": unterminated substitute pattern
configure: error: could not make ./config.status

Python 2.6.1, Python 3.0, Python 3.0.1, and Stackless 2.6.1 build  
fine, with the same configure script. It's just Stackless 3.0 and  
Stackless 3.0.1 that don't work.

Geoff Hill