ghc-cabal build failure with nonsense error message

Trying to install a second user instance of ghc-7.2.2 from ghc-7.2.2-src.tar.bz2 with config.mk.in edited to integer-simple and $GHC_PACKAGE_PATH set gives the following message:

"Configuring Cabal-1.12.0... ghc-cabal: At least the following dependencies are missing 
base >=4 && <3 && >=2 && <5
filepath  >=1 && < 1.3
unix >= 2.0 && <2.6
make[1]: ** [libraries/Cabal/cabal/dist-boot/package-data.mk] Error 1
make: ***[all] Error 1"

Edited Mar 09, 2019 by Ian Lynagh -

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