Cabal install depends on c2hs

[ZephArvanitis]

When I run cabal install opencl on Mac OSX 10.7.5, I get the following error:

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

Running cabal install c2hs followed by cabal install opencl worked perfectly.

It looks like the .cabal file lists c2hs in build-tools but not build-depends, and for whatever reason, cabal install doesn't verify that c2hs is installed. There seems to be some documentation on these options here. I tried to figure out the right thing to do but am not sure.

[zhensydow]

I understand that build-depends install libraries you need in a package, but c2hs is not a library, is a full program.

I didn't check with the last version of cabal, but usually I install c2hs before this package.