On Thu, Sep 15, 2022 at 06:11:55PM +0200, Volker Wysk wrote:
Am Donnerstag, dem 15.09.2022 um 16:31 +0100 schrieb Tom Ellis:
On Thu, Sep 15, 2022 at 05:23:10PM +0200, Volker Wysk wrote:
I've lately set up the Haskell environment on my Linux box, with no problems. Then I have installed some packages with "cabal install", again without problems. But now I'm trying to install another package and I get a dependency conflict. It doesn't seem to matter which package I try to install:
This is quite weird, because neither directory nor ghc are dependencies of rfc5051.
As a first step, can you try the following and report back whether you successfully get to a GHCi a prompt?
$ cabal repl -z --build-depends rfc5051
This results in:
desktop ~ $ cabal repl -z --build-depends rfc5051 Resolving dependencies... Build profile: -w ghc-8.8.4 -O1 In order, the following will be built (use -v for more details): - rfc5051-0.2 (lib) (requires download & build) - fake-package-0 (lib) (first run) Downloading rfc5051-0.2 Downloaded rfc5051-0.2 Starting rfc5051-0.2 (lib) Building rfc5051-0.2 (lib) Installing rfc5051-0.2 (lib) Completed rfc5051-0.2 (lib) Configuring library for fake-package-0.. Preprocessing library for fake-package-0.. Warning: No exposed modules GHCi, version 8.8.4: https://www.haskell.org/ghc/ :? for help Loaded GHCi configuration from /tmp/cabal-repl.-17863/setcwd.ghci Prelude>
Looks good, doesn't it..?
Yes, so this means that the problem is indeed the ~/.ghc/x86_64-linux-8.8.4/environments/default that Mikolaj predicted and you confirmed in a sibling thread. I'm not sure what the suggested fix is. I find this part of the cabal command line API extremely inscrutable. Tom