Question

when I configure curry’s compiler zinc, I get this:

checking for Haskell 98 compiler... 
checking for ghc... ghc
checking ghc version... 7.0
checking whether ghc supports Haskell 98... [1 of 1] Compiling Main             ( conftest.hs, conftest.o )
yes
using ghc for compilation
checking how to import IOExts... configure: error: import of IOExts does not work

so what’s IOExts? where can I find it?

Answer 1

It’s pushing up daisies is what it is. An old library module that existed about five years ago–you can find some information in the documentation for older GHC releases. I’m guessing that the code you’re trying to compile is of a similar age.

Assuming there isn’t an updated version of zinc somewhere, your choices are roughly:

• Use an antique version of GHC to build it.
• Update the code yourself to import whatever modules the contents of IOExts ended up in.
• Create a mock-IOExts module that reexports the necessary stuff.

Assuming there aren’t other problems, the third is probably easiest as a quick hack. There’s a fair chance you’ll run into more compatibility issues than just this one, though, so grabbing a copy of GHC 6.4 might be the simplest thing overall, particularly if you’re not sufficiently comfortable mucking about with the source code.