13.10.2015, 13:55, "Barry Fishman"
Arch runs the new GHC 7.10 release. When GHC went from 7.8 to 7.10 there were incompatible changes made to the base packages. ghc-vis has issues with the updated base packages, described in its bug report list (with possible workarounds):
yes, saw that when digging some more and this https://github.com/FranklinChen/ghc-vis/tree/update-for-710 but fails as well.
Your builds are failing when trying to build old versions of glib and cairo (prior to their ghc 7.10 fixes).
I believe I do have the new versions but cabal wants to pull in the old version based on the deps listed by ghc-vis, I imagine.
It also seem graphviz has also not yet been updated:
I see that now, thanks. All of this is very frustrating for someone eager to lean Haskell and running into this. I have now looked at stack and stackage and better understand the differences and similarities and will probably try to favor stack over cabal. As well I have looked further into cblrepo and the ability to create an Arch package to install via pacman, but I guess that\s further down the line. As an alternative to ghc-vis, I looked at vacuum but running into similar problems. I was basically looking at a way both to visualize data and so stepwise evaluation in Haskell, to help me better understand the language, functions and expressions, etc. I guess I will focus on the debugger for that and see if I can find my way around. Any other suggestions, please feel free.