Re: [Haskell-beginners] Problems with the Network package

1 Jun 2011

      Well it all works now, after unregistering most of the stuff in the
user package list.
And I only have one version of Process registered, so I don't know
what was wrong there. Anyway, it's working now, so I'm happy.

Thanks all for the help!

Raf

On 6/1/11, Daniel Fischer  wrote:
...
On Wednesday 01 June 2011 12:34:20, Raphael Päbst wrote:
...
Good question. Ghc-pkg list gives me Cabal-1.8.0.6 and 1.10..1.0.
Run
cabal --version
in the command shell, that tells you which version of cabal you have and
with which version of Cabal it was compiled.
(However, if the failure while trying to install network-2.3.0.2 was not an
ambiguous occurrence of closeFdWith, it's not the issue I suspect, and the
versions are less important [for the moment, at least].)
Anyway, it would be helpful if you ran the cabal install command with
higher verbosity - not sure if -v is enough, -v2 should be - and post the
output (to the list, or paste it on hpaste.org or similar and post a link
to it here).
...
Ghc-pkg check tells me that cabal-1.8.0.6 is broken though because of
some dependency on Process 1.0.1.5.
Uh oh, have you more than one process package?
That's bad, because process is one of the core libs, having several of
those lands you in dependency hell. Hope that there's only one version of
it in the global package-db and unregister those in the user-db.
ghc-pkg unregister --user process
(perhaps with the exact version if there are several).
That will probably complain that unregistering process-a.b.c.d will break
some packages, unregister those too [or, if there are too many, delete the
whole user-db] until ghc-pkg check doesn't report broken packages anymore,
then start reinstalling, but watch that cabal doesn't try to reinstall a
package already registered with ghc; you can check for that with
cabal install foo bar baz quux --dry-run
...
It's all a bit of a mystery to me.
On 6/1/11, Daniel Fischer  wrote:
...
On Wednesday 01 June 2011 11:51:02, Raphael Päbst wrote:
...
Thanks for the help. As for packages, Yesod for example fails to
install because it is trying to install network 2.3.0.2
Try
cabal install --constraint='network==2.3.0.3' yesod
?
...
...
cabal-0.8.* using version 1.8.0.2 of tha Cabal library?