[GHC] #5110: Refuse to build if no mk/build.mk is supplied

[GHC]

#5110: Refuse to build if no mk/build.mk is supplied
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    Reporter:  ezyang            |       Owner:                   
        Type:  feature request   |      Status:  new              
    Priority:  normal            |   Component:  Build System     
     Version:  7.1               |    Keywords:                   
    Testcase:                    |   Blockedby:                   
          Os:  Unknown/Multiple  |    Blocking:                   
Architecture:  Unknown/Multiple  |     Failure:  Documentation bug
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Comment(by ezyang):

 Ian suggests instead having 'boot' print a message (but not failing).

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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/5110#comment:1>
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