[boost] [git] An ignore file for the top-level repository?

I cloned a copy of the git version of the top-level Boost repository, which recursively added the individual libraries. The directions added two commands to run boot-strapping and build scripts. I had to set up an ".gitignore" file so the GUI GitHub app won't complain about those synthesized files. Shouldn't there already be an ignore file there that does this? (You only list the top-level files & directories; nested files automatically get ignored too.) I couldn't sync (i.e. upload) the ignore-file since I don't have write access for the top-level repository. So I'll get a conflict once someone does add an ignore file for everyone? Daryle W.