From 2dc6e411476462a3f22664fe256ce5b7fc1dcead Mon Sep 17 00:00:00 2001
From: Nicolas Dudebout <nicolas.dudebout@gmail.com>
Date: Fri, 16 Sep 2016 20:57:53 -0400
Subject: [PATCH] cscope: make emacs support optional

Other nixpkgs offer cscope-emacs integration and they use package.el to
register the package. When using such package, only the cscope binary is
required.
---
 pkgs/development/tools/misc/cscope/default.nix | 9 +++++----
 1 file changed, 5 insertions(+), 4 deletions(-)

diff --git a/pkgs/development/tools/misc/cscope/default.nix b/pkgs/development/tools/misc/cscope/default.nix
index 924277c53ed4..c5578e10abf1 100644
--- a/pkgs/development/tools/misc/cscope/default.nix
+++ b/pkgs/development/tools/misc/cscope/default.nix
@@ -1,4 +1,6 @@
-{ fetchurl, stdenv, ncurses, pkgconfig, emacs}:
+{ fetchurl, stdenv, ncurses, pkgconfig
+, emacsSupport ? true, emacs
+}:
 
 stdenv.mkDerivation rec {
   name = "cscope-15.8a";
@@ -11,10 +13,9 @@ stdenv.mkDerivation rec {
   configureFlags = "--with-ncurses=${ncurses.dev}";
 
   buildInputs = [ ncurses ];
-  nativeBuildInputs = [ pkgconfig emacs ];
+  nativeBuildInputs = [ pkgconfig ] + stdenv.lib.optional emacsSupport emacs;
 
-  postInstall = ''
-    # Install Emacs mode.
+  postInstall = stdenv.lib.optionalString emacsSupport ''
     cd "contrib/xcscope"
 
     sed -i "cscope-indexer" \