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When I run cabal install hoogle, I get the following:
setup: The program happy version >=1.17 is required but it could not be found
cabal: Error: some packages failed to install
haskell-src-exts-1.13.3 failed during the configure step the exeption is ExitFailure 1
$ghc -V
The Glorious Glasgow Haskell Compilation System, version 7.4.1
How to fix such a problem?
Instead of
cabal install hoogle, runcabal install alex happy && cabal install hoogle.Many packages on hackage require
alexandhappy, so it is good idea to install them aftercabal update.