From 42bcb5015467a359ae5f1acd180d2cab244d63a3 Mon Sep 17 00:00:00 2001
From: Mikael Brockman <mikael@brockman.se>
Date: Thu, 3 May 2018 15:40:08 +0300
Subject: Fix the Nix build

We use the Nix "jailbreak" function to ignore the upper bounds
on the CGI package dependency.
---
 gf.nix | 20 ++++++++++++++++++--
 1 file changed, 18 insertions(+), 2 deletions(-)

(limited to 'gf.nix')

diff --git a/gf.nix b/gf.nix
index 4b7ed2092..2926651f3 100644
--- a/gf.nix
+++ b/gf.nix
@@ -1,3 +1,19 @@
-let pkgs = import <nixpkgs> {}; in rec {
-  gf = pkgs.haskellPackages.callPackage ./default.nix {};
+let
+  # We import the package hierarchy from the NIX_PATH.
+  pkgs = import <nixpkgs> {};
+
+  #
+  # The `cgi` package has some out-of-date upper bounds.
+  # Instead of fixing that upstream, we can use the "jailbreak"
+  # function in Nix, which patches away the upper bounds.
+  #
+  # This isn't ideal, but it lets us build the dependency.
+  #
+  jailbreak = pkgs.haskell.lib.doJailbreak;
+  haskellPackages = pkgs.haskellPackages.extend (self: super: {
+    cgi = jailbreak super.cgi;
+  });
+
+in {
+  gf = haskellPackages.callPackage (import ./default.nix) {};
 }
-- 
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