Control.Parallel compile issue in Haskell
You must install the parallel package from Hackage. In most sane setups, this should be as simple as typing
cabal install parallel # note: not sudo cabal install parallel!
at your command prompt.
I'm adding a new answer (instead of a comment) for visibility reasons.
After trying Daniel's answer, I still wasn't able to do import Control.Parallel
, neither from ghci
, nor with the compiler. The install command returned a warning message like this:
➜ ~ cabal install parallel
Resolving dependencies...
Up to date
Warning: You asked to install executables, but there are no executables in
target: parallel. Perhaps you want to use --lib to install libraries instead.
What ultimately resolved the issue was:
cabal install --lib parallel