Retstricting versions/builds with pkgtools

[Todd Gruhn <tgruhn2%gmail.com@localhost>]

I noticed that I often get Python checked and/or installed when I
build software.

I currently have 3 versions of Python on my system.

If the package requires Python-2.7, how well will it work if
Python-3.8 is already
installed? Can I tell pkgtools to skip installing Python if a certain ver of
Python is already installed? Is this advisable?