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GHC could not execute htfpp

I am getting this error 

ghc: could not execute: htfpp

when I try to load a file with {-# OPTIONS_GHC -F -pgmF htfpp #-} in its header. I have installed htf successfully (v0.12)

How can I solve this (on Linux and on Windows)

Thank you!

Solution

  • community-wiki answer for posterity:

    htfpp was not in the path. To find how to alter the path, one looks in the ~/.cabal folder for a config file and finds where cabal installs binaries by default. That directory needs to be added to the path, or the installed binary needs to be moved from there to a directory that is in the path. Then GHC can run it with the -pgmF flag.