Building gcc with gmp source is failing with "Can't find gmp headers" (Centos 6.5)

[Marc Glisse]

On Mon, 14 Apr 2014, Dave Gittins wrote:

> I need to build gcc 4.4.0 (for various reasons beyond my control!) on
> my Centos 6.5 box. I want the resulting binaries to be usable by
> others who may not have the same external packages installed. So I am
> attempting to follow the instructions that suggest placing the source
> distributions for GMP/MPFR/MPC/ISL/CLooG in subdirectories of the main
> source directory.

Note that isl/cloog (hmm, wasn't gcc using ppl instead of isl at the time? 
Where did you find those requirements?) are optional, so easiest is to 
avoid them. For a while (I hope it was fixed since but I haven't checked), 
it worked to let gcc build gmp/mpfr/mpc, it worked to let gcc build ppl 
(or isl) and cloog if you already had gmp/mpfr/mpc in the system, but it 
couldn't build all 5 because it didn't pass suitable options to the last 
ones to let them use the first 3, and that seems to be the issue you are 
hitting.

Btw, are you sure you can't use at least gcc-4.4.x for some larger value 
of x?

-- 
Marc Glisse