compile error with GHC 7.4

[hvr]

I suggest just setting a lower bound, e.g. base >= 4.6 to declare support for GHC 7.6 or later (and this also evades the memory issue with GHC 7.4)

Configuring component lib from vty-5.14
Preprocessing library vty-5.14...

src/Graphics/Vty/Config.hs:97:8:
    Could not find module `GHC.Generics'
    It is a member of the hidden package `ghc-prim'.
    Perhaps you need to add `ghc-prim' to the build-depends in your .cabal file.
    Use -v to see a list of the files searched for.
cabal: Failed to build vty-5.14 (which is required by exe:vty-mode-demo from
vty-5.14 and exe:vty-demo from vty-5.14).

[jtdaugherty]

Done. Thanks!