`checking size of mp_limb_t... 0` and `configure: error: Oops, mp_limb_t doesn't seem to work` when compiling the Microchip XC32 compiler from source

[Gabriel Staples, ElectricRCAircraftGuy.com]

I could really use some help here. Many thanks in advance. I don't know if
this is a GMP problem exactly, but I've described it pretty thoroughly
here:

GMP gets stuck in the configure process. Again, this may not be directly
due to GMP, but this is a community effort to compile the GCC Microchip
PIC32 compiler from source so we don't need to buy a license to program a
chip.

`checking size of mp_limb_t... 0` and `configure: error: Oops, mp_limb_t
doesn't seem to work` when compiling the Microchip XC32 compiler from
source  <https://stackoverflow.com/q/77414776/4561887>

Sincerely,

Gabriel Staples