Install Hombrew and few more for oxygen ruby -e “$(curl https://raw.githubusercontent.com/Homebrew/install/master/install)” brew doctor brew install gdlib brew install doxygen –with-dot –with-libclang cd /tmp curl -O http://www.mcternan.me.uk/mscgen/software/mscgen-src-0.20.tar.gz tar xvzf mscgen-src-0.20.tar.gz Build mscgen: cd mscgen-0.20/ echo $PATH export PATH=$PATH:/opt/pkgconfig/bin ./configure brew install libgd ./configure make make check sudo make install Install graphviz: brew install graphviz