I was trying to use the cassandra-thrift haskell package and there was a bug in one if it's dependencies, thrift. I fixed the bug in thrift and then went to the nix haskell guide to find out how to override "thrift" with my bugfixed version.
I came up with this from the haskell guide ( http://nixos.org/nixpkgs/manual/#how-to-build-projects-that-depend-on-each-other ): { pkgs }: { packageOverrides = super: let self = super.pkgs; in { haskellPackages = super.haskellPackages.override { overrides = self: super: { thrift = self.callPackage /home/cody/sources/thrift/lib/hs {}; }; }; }; allowUnfree = true; firefox = { enableGoogleTalkPlugin = true; enableAdobeFlash = true; }; and then finally tried the example from ocharle's wiki on nix/haskell, which involved putting the override in shell.nix like below: with (import <nixpkgs> {}).pkgs; let modifiedHaskellPackages = haskellPackages.override { overrides = self: super: { thrift = self.callPackage /home/cody/sources/thrift/lib/hs {}; }; }; in modifiedHaskellPackages.hscassandra.env I'm a little dismayed since I even went through all 19 or so of the nix pills( http://lethalman.blogspot.com/2014/07/nix-pill-1-why-you-should-give-it-try.html) thinking I just needed to brush up on nix. If someone could also explain these snippets and how they work in detail or differently than the resources I've looked at many times: http://nixos.org/nixpkgs/manual/#how-to-build-projects-that-depend-on-each-other http://lethalman.blogspot.com/2014/07/nix-pill-1-why-you-should-give-it-try.html http://wiki.ocharles.org.uk/Nix#multiple-project-usage If possible, any example git repositories with multiple haskell projects/overrides would be amazing. Thank you all for your time. Sincerely, Cody Goodman
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