attribute ‘versionOlder’ missing

[themoritz]

When I run styx configure, I get the following error:

nix-shell .styx/shell.nix --pure --run "cabal configure"
error: attribute ‘versionOlder’ missing, at /nix/store/371ww68m2hxjiypl1ylfqpnxdsy8j5k7-nixpkgs-17.03pre99414.b2b32ea/nixpkgs/pkgs/development/haskell-modules/with-packages-wrapper.nix:8:8
(use ‘--show-trace’ to show detailed location information)
styx: callCommand: nix-shell .styx/shell.nix --pure --run "cabal configure" (exit 1): failed

Here is my styx.yaml:

local-packages:
  server:
    location: .
  lib:
    location: ../lib

I'm running nixos 17.03pre99414.b2b32ea (Gorilla).