From a3cc98019306d017452379899d784a6037a537c1 Mon Sep 17 00:00:00 2001
From: Peter Simons <simons@cryp.to>
Date: Tue, 11 Jun 2013 11:55:52 +0200
Subject: [PATCH] groff: explicitly disable X11 support in configure to avoid
 impure builds

Without this flag, the configure script will find /usr/X11 on host system and
assume that it can build with X11 support.
---
 pkgs/tools/text/groff/default.nix | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/pkgs/tools/text/groff/default.nix b/pkgs/tools/text/groff/default.nix
index 90c5ef0ba819..6a11882fdc93 100644
--- a/pkgs/tools/text/groff/default.nix
+++ b/pkgs/tools/text/groff/default.nix
@@ -11,6 +11,13 @@ stdenv.mkDerivation rec {
   buildInputs = [ ghostscript ];
   nativeBuildInputs = [ perl ];
 
+  # Builds running without a chroot environment may detect the presence
+  # of /usr/X11 in the host system, leading to an impure build of the
+  # package. To avoid this issue, X11 support is explicitly disabled.
+  # Note: If we ever want to *enable* X11 support, then we'll probably
+  # have to pass "--with-appresdir", too.
+  configureFlags = "--without-x";
+
   doCheck = true;
 
   crossAttrs = {