nixpkgs/pkgs/build-support/setup-hooks/move-lib64.sh

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# This setup hook, for each output, moves everything in $output/lib64
# to $output/lib, and replaces $output/lib64 with a symlink to
# $output/lib. The rationale is that lib64 directories are unnecessary
# in Nix (since 32-bit and 64-bit builds of a package are in different
# store paths anyway).
# If the move would overwrite anything, it should fail on rmdir.
fixupOutputHooks+=(_moveLib64)
_moveLib64() {
if [ "${dontMoveLib64-}" = 1 ]; then return; fi
if [ ! -e "$prefix/lib64" -o -L "$prefix/lib64" ]; then return; fi
echo "moving $prefix/lib64/* to $prefix/lib"
mkdir -p $prefix/lib
shopt -s dotglob
for i in $prefix/lib64/*; do
mv --no-clobber "$i" $prefix/lib
done
shopt -u dotglob
rmdir $prefix/lib64
ln -s lib $prefix/lib64
}