Hello Arch Haskell, I am happy to announce PKGBUILDs for legacy versions of GHC that can coexist in the same install. This includes coexisting with the current GHC provided by the arch-haskell repo. These PKGBUILDs are available on AUR. https://aur.archlinux.org/packages/?K=ghc https://aur.archlinux.org/packages/ghc7.8-bin/ https://aur.archlinux.org/packages/ghc7.8/ https://aur.archlinux.org/packages/ghc7.6-bin/ https://aur.archlinux.org/packages/ghc7.6/ (They were silently put on AUR months ago, but I have not announced anywhere.) For example, on my arch install, I have 5 different versions of ghc: $ pacman -Qs ghc local/ghc 8.0.1-1 local/ghc7.4 7.4.2-2 local/ghc7.6 7.6.3-3 local/ghc7.8 7.8.4-1 local/ghc7.10 7.10.3-1 This works by having binaries and relevant files with suffixes: $ pacman -Ql ghc7.6 | grep /usr/bin ghc7.6 /usr/bin/ ghc7.6 /usr/bin/ghc-7.6 ghc7.6 /usr/bin/ghc-pkg-7.6 ghc7.6 /usr/bin/ghci-7.6 ... For example, just do `ghc7.6 file.hs` to compile a file with ghc-7.6.3. Useful for testing libraries for compatibility with older versions of GHC. All legacy versions have a binary PKGBUILD (-bin) and a source PKGBUILD, the earlier can be used to compile the latter. Ideally, I think those packages could be available on a standalone repository (arch-haskell-legacy or something like that). Or even as part of the main arch-haskell repo. Unfortunately, I do not have the server resources needed for that: each version takes about 1.5 hours to compile, the resulting packages would also consume some bandwidth when downloaded. If anyone is interested in setting up such a repository (Magnus?) -- feel free to use the PKGBUILDs I provided on AUR. Also, I will be happy to help with any scripting necessary to set this up. Btw, many thanks to Magnus Therning for providing the arch-haskell repository. It has saved me hours since I started using it. Regards, Rudy