cabal-install and executable dependencies

[harry]

Herbert Valerio Riedel wrote
> https://github.com/haskell/cabal/blob/master/Cabal/Distribution/Simple/Program/Builtin.hs

Ah, a hard-coded list :-)

So I would like to propose that cabal should install build-tool dependencies
automatically if it can find them on hackage, and that package authors
should actually start listing them. I started this thread after numerous
failed installations of packages which depended on some undeclared
executable. (e.g. happstack, which has depends on hsx2hs, which in turns
depends on happy, but none of this is declared in the cabal files.)



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