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by KWxIUElW8Xt0tD9 829 days ago
Bell Labs had a very nice portability framework also -- there was a Cygwin-like product called U/WIN that made extensive use of it -- might find it associated with ksh93 maybe.

Speaking of Bell Labs, there are some great ideas for a build tool in the Bell Labs "nmake" tool - I believe it was originally created to speed up ESS5 switch builds, which took 3 days before make. It has programmable header file scanning for example, a shell coprocess to avoid all the fork/exec of standard make, build state files, lots of other things I have forgotten.