The error message you're getting is pretty un-helpful - what's happened is that EMGM has declared that it is only compatible with template-haskell version 2.3, however GHC 6.12 ships with template-haskell version 2.4. So caball helpfully tries to install the older version of template-haskell and fails. (for the curious, if you get packed-string to install, installing template-haskell 2.3 will still result in misery, as it is a "magic" package which relies on being installed at the same time as GHC - there's no simple way to have multiple versions working). To get a better error message, you'll want to edit the EMGM package description and allow it to try and build with template-haskell 2.4 (this will be the file names 'emgm.cabal'). Antoine On Mon, Oct 4, 2010 at 11:36 PM, Hans Peter Würmli wrote:

I tried to install EMGM from Hackagedb under ghc 6.12.1 (Debian Packages). The process ends with:

"... Building packedstring-0.1.0.1...

Data/PackedString.hs:83:7:     Could not find module `Data.Data':       It is a member of the hidden package `base'.       Perhaps you need to add `base' to the build-depends in your .cabal file.       Use -v to see a list of the files searched for. cabal: Error: some packages failed to install: emgm-0.3.1 depends on packedstring-0.1.0.1 which failed to install. packedstring-0.1.0.1 failed during the building phase. The exception was: ExitFailure 1 template-haskell-2.3.0.1 depends on packedstring-0.1.0.1 which failed to install."

Also I noticed that the last upload was version 0.3.1. Is the library still under maintenance?

Cheers

Hans Peter _______________________________________________ Generics mailing list Generics@haskell.org http://www.haskell.org/mailman/listinfo/generics