Hi, I'm currently trying to compile gmp-4.3.1 under cygwin 1.5.25-15 on Windows XP/SP3 with a Pentium M (Centrino) processor and get the following error (which I haven't seen anywhere in searches on the Internet). The initial problem seems to be in config.sub, as you can see from the output below. Find attached a compressed config.log Thanks in advance Jim Jim Skea@JimsNewLaptop ~/gmp-4.3.1 $ ./configure -pc' not recognizede `pentiummInvalid configuration `pentiumm -pc-cygwin failed /bin/sh ./config.sub pentiumm Jim Skea@JimsNewLaptop ~/gmp-4.3.1 $ uname -a CYGWIN_NT-5.1 JimsNewLaptop 1.5.25(0.156/4/2) 2008-06-12 19:34 i686 Cygwin Jim Skea@JimsNewLaptop ~/gmp-4.3.1 $ gcc -v Using built-in specs. Target: djgpp Configured with: /gnu/gcc-4.10/configure djgpp --prefix=/dev/env/DJDIR --disable -nls --disable-werror --enable-languages=c,c++,<div id=":2q" class="ii gt">fortran,objc,obj-c++,ada Thread model: single gcc version 4.1.0 Jim Skea@JimsNewLaptop ~/gmp-4.3.1 $ ./config.guess -pc-cygwin Jim Skea@JimsNewLaptop ~/gmp-4.3.1 $ ./configfsf.guess i686-pc-cygwin </div>