If you follow the above steps correctly you should successfully install the Fallout 4 Script Extender. One thing to remember is in order to use the mods you will have to run the game through ...
git clone https://github.com/ianpatt/common git clone https://github.com/ianpatt/f4se cmake -B common/build -S common -DCMAKE_INSTALL_PREFIX=extern common cmake ...