Doing a plan "configure" then "make"; the compilation breaks due to // 
style comments in a file called Objects/frameobject.c:

cc_r -qlanglvl=extc89 -c  -DNDEBUG -O  -I. -IInclude -I./Include   -
DPy_BUILD_CORE -o Objects/frameobject.o Objects/frameobject.c
"Objects/frameobject.c", line 520.9: 1506-046 (S) Syntax error.

Full transcript attached.

Furthermore, attempting to select a more permissive (better?) compiler, 
with "CC=c99 ./configure --without-gcc" for example, doesn't work 
because of the bug reported in http://bugs.python.org/issue1633863 (CC 
is ignored).  I will comment separately in that issue.

It is my understanding (per my blog article http://drj11.wordpress.com/2008/10/02/python-and-bragging-about-c89/ ) 
that the code is now c89 clean (or at least as clean as «gcc -std=c89 -
Werror» can make it.  That means you should be able to close this bug 
fairly quickly. :)

After I've hacked the configure script the build still fails, but for 
different reasons.  I'll file another bug for that.