While I'm busy building GMP on my Pentium M laptop, I thought I'd ask a question about target processors  (it's been building it for about an hour so for, though oddly it isn't taking very much processor power to build). I notice that in the benchmarks, the Pentium M is grouped with the PIII not the P4, even though the Pentium-M is capable of running the SSE2 and all of the same instructions as a P4 (as far as I know). Is there any reason not to compile with a P4 target and optimizations if you're going to run on a Pentium M?  Is the Pentium M slower running SSE2 than running PIII code? I'd test it myself, but at this rate it looks like every build takes over an hour. I have a few other questions too, but I'll RTFM (and read the fine code too), first. Josh Scholar PS. it just finished the build at about 1 1/2 hours.  Now to make the test.  It's a mystery why the processor usage stayed low throughout the build, it didn't seem that disk bount.  I'll bet it could have built in 1/2 the time. Ooh, it just failed "make check" (I'm running MSys). From the error message it looks like it cut off the beginning of a path at a space character.  I guess I'll have rename the directory structure to get rid of spaces. libtool: link: cannot find the library `fog/gmp-4.2.2/libgmp.la' or unhandled argument `fog/gmp-4.2.2/libgmp.la' make[4]: *** [t-bswap.exe] Error 1 make[4]: Leaving directory `/c/assembler/agner fog/gmp- 4.2.2/tests' make[3]: *** [check-am] Error 2 make[3]: Leaving directory `/c/assembler/agner fog/gmp-4.2.2/tests' make[2]: *** [check-recursive] Error 1 make[2]: Leaving directory `/c/assembler/agner fog/gmp- 4.2.2/tests' make[1]: *** [check-recursive] Error 1 make[1]: Leaving directory `/c/assembler/agner fog/gmp-4.2.2' make: *** [check] Error 2 See how the first quoted couple of quoted directories start 'fog...' instead of '/c/assembler/agner fog'?