So, I'm working on fixing PR bootstrap/44425, and have this patch to have the top-level configure script check in the value passed to `--prefix=` when looking for gmp/mpfr/mpc. It "works" (in that configuring with just `--prefix=` and none of `--with-gmp=`/`--with-mpfr=`/`--with-mpc=` now works where it failed before), but unfortunately it results in a bunch of duplicated `-I`/`-L` flags stuck in ${gmplibs} and ${gmpinc}... is that acceptable or should I try another approach? Eric
patch-configure.diff
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