Resolving dependencies...
Downloading OpenCL-1.0.3.4...
Configuring OpenCL-1.0.3.4...
cabal: The program c2hs is required but it could not be found.
Failed to install OpenCL-1.0.3.4
cabal: Error: some packages failed to install:
OpenCL-1.0.3.4 failed during the configure step. The exception was:
ExitFailure 1