Easiest would be to simply download the scripts from my newest 18.06 build and to create the build env with them. 18.06 requires different patches than master, so you need those anyway.
And note that likely you should build from the 18.06 head to get the newest fixes, instead of the half-year old 18.06.2 release. If you really want the old 18.06.2, read advice from this thread