mpfr configure fails on OS X 10.4.11 (i386) due to wrong GMP_NUMB_BITS value

[Moresteck (Moresteck)]

config.log reports that GMP_NUMB_BITS is 64 somehow, even though in gmp.h it's defined as 32.

configure:18688: ./conftest
GMP_NUMB_BITS     = 64
sizeof(mp_limb_t) = 4
sizeof(mp_limb_t) * CHAR_BIT = 32 != GMP_NUMB_BITS
configure:18688: $? = 1
configure: program exited with status 1

configure:18694: result: no
configure:18696: error: GMP_NUMB_BITS and sizeof(mp_limb_t) are not consistent.
You probably need to change some of the GMP or MPFR compile options.
See 'config.log' for details (search for GMP_NUMB_BITS).

Maybe gmp is built incorrectly, or maybe the blame is on mpfr?

Attached are full config.log, build.log and terminal output from trying to install libarchive.