Why does you patch test for -mno-fused-madd? If it isn't actually needed 
for something I'd rather not have that logic in the configure file, 
determining which bits of that file are actually needed for supported 
OS-es is hard enough as it is.

-Wno-long-double is needed when compiling on old versions of OSX, where 
"long double" worked but wasn't actually useful. Keeping that option 
seems to be harmless.

-no-cpp-precomp was necessary for several packages on older releases of 
OSX. I'll test on a 10.3 box when I have time (which is the oldest I can 
test on).