@@ -43,10 +43,11 @@ with rec {
4343{ mkDerivation, stdenv, flags ? {} }:
4444let expr = expr0 flags;
4545 pname = expr.package.identifier.name;
46+ pversion = expr.package.identifier.version;
4647in mkDerivation ({
4748 inherit pname;
48− version = expr.package.identifier.version;
49− sha256 = null;
49+ version = pversion;
50+ sha256 = (import <hackage/all-cabal-hashes.nix>).${pname}.${pversion} or null;
5051
5152 isLibrary = builtins.hasAttr pname expr.components;
5253 isExecutable = builtins.hasAttr "exes" expr.components;