how to build package against specified python version
/usr/ports/textproc/py-html2text # make PYTHON_PKGNAMEPREFIX=py35- USES=python:3.5 package
https://www.freebsd.org/doc/en/books/porters-handbook/using-python.html
jasiu virtual world
about everything and nothing… from FreebSD 4.1 to latest-STABLE
