From cb3e282cdacdd1e42c4e62712263f515a5ffd128 Mon Sep 17 00:00:00 2001
From: Jude Taylor <me@jude.bio>
Date: Thu, 2 Jul 2015 18:59:10 -0700
Subject: [PATCH] unique host deps, otherwise we get 600000 char derivations

---
 pkgs/stdenv/generic/default.nix | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/pkgs/stdenv/generic/default.nix b/pkgs/stdenv/generic/default.nix
index 07486093da8..fe7bec54ba0 100644
--- a/pkgs/stdenv/generic/default.nix
+++ b/pkgs/stdenv/generic/default.nix
@@ -147,8 +147,9 @@ let
           __impureHostDeps = attrs.__impureHostDeps or [];
           __propagatedImpureHostDeps = attrs.__propagatedImpureHostDeps or [];
 
-          computedImpureHostDeps           = lib.concatMap (input: input.__propagatedImpureHostDeps or []) (extraBuildInputs ++ buildInputs ++ nativeBuildInputs);
-          computedPropagatedImpureHostDeps = lib.concatMap (input: input.__propagatedImpureHostDeps or []) (propagatedBuildInputs ++ propagatedNativeBuildInputs);
+          # TODO: remove lib.unique once nix has a list canonicalization primitive
+          computedImpureHostDeps           = lib.unique (lib.concatMap (input: input.__propagatedImpureHostDeps or []) (extraBuildInputs ++ buildInputs ++ nativeBuildInputs));
+          computedPropagatedImpureHostDeps = lib.unique (lib.concatMap (input: input.__propagatedImpureHostDeps or []) (propagatedBuildInputs ++ propagatedNativeBuildInputs));
         in
         {
           builder = attrs.realBuilder or shell;