Cabal IPPrint package fails to build

Question

I am trying to get this coloured ghci prompt to work. I am getting the following error which I suspect is due to cabal not updating the right package. Anyone has any idea?

; cabal install IPPrint 
[...]
System/Unix/Chroot.hs:23:49:
    Module `System.Process' does not export `showCommandForUser'
cabal: Error: some packages failed to install:
Extra-1.42 depends on Unixutils-1.52 which failed to install.
Unixutils-1.52 failed during the building phase. The exception was:
ExitFailure 1
ipprint-0.4.1 depends on Unixutils-1.52 which failed to install.

The prompt should look like this:

haskell ghci colour prompt

score 1 · Accepted Answer · answered Dec 06 '12 at 14:20

1

showCommandForUser was added in version 1.1 of the process package. You need ghc-7.2 or later to have that (process is one of the boot packages, installing a version other than that came with GHC is not recommended unless you know very well what you are doing; reinstalling boot packages is likely to cause breakage among the installed packages).

If you have an older GHC, upgrading GHC is a good idea anyway.

answered Dec 06 '12 at 14:20

Daniel Fischer

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Ah, it would be nice to have a package for Fedora 16 that was not old. Meh. – Sardathrion - against SE abuse Dec 06 '12 at 15:50
Is there no ghc package with a newer GHC than 7.0 for Fedora? Even if not, you can install a vanilla binary (may be problematic if the gmp versions don't match) or build one from source. Building from source takes a while, but you don't need to do that too often. – Daniel Fischer Dec 06 '12 at 15:54
The [justhub](http://www.justhub.org/) distribution does have an up to date version of both ghc and the Haskell Platform. There are normal up to date packages but F16 is a little old now in release Fedora terms. – Sardathrion - against SE abuse Dec 06 '12 at 16:00
Meh, even with that more failures. I give up. – Sardathrion - against SE abuse Dec 06 '12 at 16:16
What failures? And what is the "that" in "even with that"? It may not be too bad. – Daniel Fischer Dec 06 '12 at 16:19
`cabal install IPPrint 'Extra > 1.45'` was the thing I was missing. Without forcing the package, I got Extra 1.42 which gives me errors. Got there! Thanks. – Sardathrion - against SE abuse Dec 06 '12 at 16:27

Cabal IPPrint package fails to build

1 Answers1