From 20ebca303e3372317c01c0c54f64f3d6423b094c Mon Sep 17 00:00:00 2001
From: Shea Levy <shea@shealevy.com>
Date: Sun, 24 Jul 2011 20:24:23 +0000
Subject: [PATCH] Add comments explaining the purpose of the postBuild prepend

svn path=/nixpkgs/trunk/; revision=27922
---
 pkgs/os-specific/linux/kernel/generic.nix | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/pkgs/os-specific/linux/kernel/generic.nix b/pkgs/os-specific/linux/kernel/generic.nix
index 46ebb2b8fff4..b5d10f069211 100644
--- a/pkgs/os-specific/linux/kernel/generic.nix
+++ b/pkgs/os-specific/linux/kernel/generic.nix
@@ -77,6 +77,11 @@ stdenv.mkDerivation {
 
   inherit preConfigure src module_init_tools localVersion postInstall;
 
+  #Currently, the builder sets $MODULE_DIR during installPhase. This causes
+  #problems with at least linux 3.0, so we need to conditionally avoid
+  #setting $MODULE_DIR. This prepend to postBuild accomplishes this with a
+  #sed/eval trick thanks to MarcWeber
+
   postBuild = (if setModuleDir then "" else '' 
     eval "$(type installPhase | sed -e '1d' -e '/export MODULE_DIR/d')";
   '') + postBuild;