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# default package build
MPN_PATH=" x86_64/k8 x86_64 generic"
...
# manually on the broadwell machine, includes extra optimizations
MPN_PATH=" x86_64/coreibwl x86_64/coreihwl x86_64/coreisbr x86_64/core
+inhm x86_64/core2 x86_64 generic"

cd gmp-6.1.2
./configure --prefix=/opt/perl-5.26.1
...
make test
make install

time /opt/perl-5.26.1/bin/perl -Mntheory=:all -E 'say Pi(1e6)' | wc -c
1000002
...
91m  7.581s  using system gmp libraries
67m 40.951s  using gmp libraries from /opt/perl-5.26.1/lib