On Wed, 2005-11-30 at 22:48 -0500, Robert Dockins wrote:

I've just run across a problem with my cabal build system -- I'm not yet sure if this is a cabal problem or a system configuration problem.

I've been developing a package on OSX using the ghc 6.4.1 and cabal from darwinports. All is fine and dandy. However, today I've sucked my darcs repo down to my machine at home (running Gentoo linux) and now my package won't build. (this time with GHC 6.4.1 from portage and cabal 1.1.3)

It halts while apparently running an Alex generated lexer through CPP, with the error:

ghcconfig.h: No such file or directory

My GHC install has this file at /usr/lib/ghc-6.4.1/include, but it clearly isn't in the include path that cabal is using.

So the question is -- is this a cabal bug of some kind, or is the gentoo setup messed up some how? How should I proceed?

Are you using cpphs? When you use ghc to do the 'cpp'ing it adds -I/usr/lib/ghc-6.4.1/include but if Cabal is using cpphs then I suspect that it will not. You can pass -v to Cabal to get it to show you exactly what it is invoking: runhaskell Setup.lhs build -v Alternatively you can specify the /usr/lib/ghc-6.4.1/include directory in the "include-dirs" field in the .cabal file, however this is not ideal of course since that path will vary between systems and ghc versions. Duncan