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PREFIX="/usr/local"

...
   --build="${TRIPLE}" --prefix="${PREFIX}" --disable-shared --enable-
+static \
   --enable-cxx --enable-assembly --enable-fft

cd gmp-6.1.2
sh /path/to/configure-gmp.sh
...

sudo make install-strip

PREFIX="/usr/local"

...
   --disable-dependency-tracking --disable-assert --enable-thread-safe
+ \
   --with-gmp="${PREFIX}"

cd mpfr-3.1.2
patch -N -Z -p1 < /path/to/allpatches.txt
...

sudo make install-strip

$ time /opt/perl-5.26.1/bin/perl -Mntheory=:all -E 'say Pi(1e6)' | wc 
+-c
 1000002
...
user  0m1.408s
sys   0m0.017s