See https://trac.macports.org/wiki/howto/InstallingOlderPort and maybe https://www.mail-archive.com/[email protected]/msg05835.html
> Am 12.08.2020 um 13:54 schrieb Richard L. Hamilton <[email protected]>: > > I've forgotten how to do this, can someone explain it? I've fetched the old > version of the Portfile corresponding to the version that I want. > Specifically, there are some problems thought to be due to bison 3.7 and > later, so I want to build bison 3.6.4 (keeping 3.7.1, but deactivated). >
