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Building gcc on X86_64

I'm trying to bootstrap gcc on x86_64.

Here is my configure line:

../gcc/configure --prefix=/home/ed/bin-4.3 --enable-languages=c,c++,fortran --with-gmp-dir=/home/ed/gcc/gmp-4.2.1 --with-mpfr-dir=/home/ed/gcc/mpfr-2.2.0

I just unpacked the GMP and MPFR source directories in the gcc source tree.

My question is why does the configure check require the mpfr library to already be built when I put two source directories?  It seems like it should just check the headers.  Then it should configure and build those packages using the most useful flags for GCC.

This file contains any messages produced by compilers while
running configure, to aid debugging if configure makes a mistake.

configure:614: checking host system type
configure:635: checking target system type
configure:653: checking build system type
configure:708: checking for a BSD compatible install
configure:761: checking whether ln works
configure:785: checking whether ln -s works
configure:1850: checking for gcc
configure:1963: checking whether the C compiler (gcc  ) works
configure:1979: gcc -o conftest    conftest.c  1>&5
configure:2005: checking whether the C compiler (gcc  ) is a cross-compiler
configure:2010: checking whether we are using GNU C
configure:2019: gcc -E conftest.c
configure:2038: checking whether gcc accepts -g
configure:2105: checking for gnatbind
configure:2170: checking whether compiler driver understands Ada
configure:2202: checking how to compare bootstrapped objects
configure:2300: checking for correct version of gmp.h
configure:2313: gcc -c -g -O2 -I/home/ed/gcc/mpfr-2.2.0 -I/home/ed/gcc/gmp-4.2.1  conftest.c 1>&5
configure:2328: checking for correct version of mpfr.h
configure:2343: gcc -o conftest -g -O2 -I/home/ed/gcc/mpfr-2.2.0 -I/home/ed/gcc/gmp-4.2.1   conftest.c  /home/ed/gcc/mpfr-2.2.0/libmpfr.a 1>&5
gcc: /home/ed/gcc/mpfr-2.2.0/libmpfr.a: No such file or directory
configure: failed program was:
#line 2330 "configure"
#include "confdefs.h"
#include <gmp.h>
#include <mpfr.h>
int main() {

  choke me
  mpfr_t n; mpfr_init(n);

; return 0; }

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