It's well defined, but there's no good solution to this problem yet! See: http://www.well-typed.com/blog/2014/09/how-we-might-abolish-cabal-hell-part-1/ http://

It's well defined, but there's no good solution to this problem yet! See: http://www.well-typed.com/blog/2014/09/how-we-might-abolish-cabal-hell-part-1/ http://www.well-typed.com/blog/2014/09/how-we-might-abolish-... It's true for every language out there, not just Haskell.