You can leave the instructions there - you might want them again, later. They are “comments” and they are completely ignored by the compiler.
Be sure to check all the variables that need changing. I tried to keep them together, but in a few places that was not possible. Ask if you are not sure.
It would probably be best to try a test compile (“verify”) before changing anything. If that goes OK, then you know that your libraries installation was good.
In “C” and “C++”, everything on the line after a double slash // is a comment and is ignored.
Everything between slash-star /* and star-slash */ is a comment - on the same line or separated by many lines - is a comment and is ignored.