[GHC] #3619: allow to set ghc search path globally (a'la CPATH)

[GHC]

#3619: allow to set ghc search path globally (a'la CPATH)
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Reporter:  tari3x            |          Owner:                  
    Type:  feature request   |         Status:  new             
Priority:  normal            |      Component:  Compiler        
 Version:  6.10.4            |       Severity:  normal          
Keywords:                    |       Testcase:                  
      Os:  Unknown/Multiple  |   Architecture:  Unknown/Multiple
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 I'd like a mechanism for ghc similar to setting the CPATH variable for
 gcc. I'd like ghc to look in the given list of paths every time it
 compiles something, without me having to retype the flags.

   For ghci there is .ghci, but it gets ignored when I run ghc.

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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/3619>
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