On 24 September 2015 at 17:56, Gershom B <gersh...@gmail.com> wrote:
> Consider for example if we have a configure build-type, that runs an autoconf 
> script. It is not enough that the executable we run be in the path, but also 
> that the “path” available to the autoconf script be amended as well.

Yes, 'extra-prog-path' also affects the PATH environment variable of
the programs invoked by cabal-install:

https://github.com/haskell/cabal/blob/master/Cabal/Distribution/Simple/Program/Run.hs#L177
https://github.com/haskell/cabal/blob/master/Cabal/Distribution/Simple/Program/Db.hs#L344
https://github.com/haskell/cabal/blob/master/Cabal/Distribution/Simple/Configure.hs#L808
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