Hello Bill, thanks for replying. My system is:
$ uname -a
Linux tosharch 2.6.31-ARCH #1 SMP PREEMPT Tue Nov 10 19:48:17 CET 2009
i686 Intel(R) Core(TM)2 Duo CPU T7250 @ 2.00GHz GenuineIntel GNU/Linux

so it's a 32bit. Old? It's no older than 3 years, which (sigh) I guess
is old in computer terms.

I did find out something. I downloaded as you suggested mpir 1.3.0-rc3
and it compiled without errors. 'make check' also didn't give errors
and reported "All 3 tests passed". I was looking at the ./configure
output and comparing it to the one from the sage compilation and I
spotted this difference:

mpir 1.2.p9 (from sage's sources):
using ABI="64"
      CC="gcc -std=gnu99"
      CFLAGS="-march=i686 -mtune=core2 -O2 -pipe"
      CPPFLAGS=""
      CXX="g++"
      CXXFLAGS="-march=i686 -mtune=core2 -O2 -pipe"
      MPN_PATH=" x86_64/core2 x86_64 generic"

mpir 1.3.0-rc3:
using ABI="32"
      CC="gcc -std=gnu99"
      CFLAGS="-m32 -O2 -fomit-frame-pointer -mtune=core2 -march=core2"
      CPPFLAGS=""
      MPN_PATH=" x86/core2 x86 generic"

is this relevant? I'll ask sage people how to get it to use ABI=32 and
see if it works

regards,
Renato

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