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http://emacs.rubikitch.com/emacs251-install/
cd src
curl -OL http://ftpmirror.gnu.org/emacs/emacs-25.2.tar.xz
tar Jxvf emacs-25.2.tar.xz
cd emacs-25.2
./configure --without-x
make
make install
cd nextstep
mv Emacs.app/ /Applications/Emacs.app