From 5265d551a96e701387dc767ed62e3cbc9074fe90 Mon Sep 17 00:00:00 2001
From: Thomas Tuegel <ttuegel@mailbox.org>
Date: Fri, 21 Jul 2017 09:01:23 -0500
Subject: [PATCH] grub2: unset CPP

Commit 093cc00cdd9d8cf31ecce5bc1dd3645c460a1b98 sets the environment variable
`CPP' by default, but this intereferes with dependency calculation.
---
 pkgs/tools/misc/grub/2.0x.nix | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/pkgs/tools/misc/grub/2.0x.nix b/pkgs/tools/misc/grub/2.0x.nix
index 2bbeea8133e..634022e88e0 100644
--- a/pkgs/tools/misc/grub/2.0x.nix
+++ b/pkgs/tools/misc/grub/2.0x.nix
@@ -85,6 +85,8 @@ stdenv.mkDerivation rec {
        # See <http://www.mail-archive.com/qemu-devel@nongnu.org/msg22775.html>.
        sed -i "tests/util/grub-shell.in" \
            -e's/qemu-system-i386/qemu-system-x86_64 -nodefaults/g'
+
+      unset CPP # setting CPP intereferes with dependency calculation
     '';
 
   prePatch =