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Support for non-standard program search $PATH #1415
Various internal infrastructure changes, but ultimately it should help us solve the problem where new users install programs like alex/happy/c2hs etc and then cabal cannot find the programs they just installed, because it puts them in a place that is not on the
New users will get an entry in their
And this dir will also be searched for programs, along with the
Internally we add some infrastructure for allowing configured programs to have arbitrary env var overrides. We could also use this for other purposes (e.g. ignoring the
It also means that internally in the library we can have a local "virtual"