From c958486eea989e47b5e0b2a4e674c5f185e12f74 Mon Sep 17 00:00:00 2001
From: Joachim Fasting <joachifm@fastmail.fm>
Date: Wed, 1 Apr 2015 13:51:56 +0200
Subject: [PATCH] gnu-smalltalk: optional emacs support

---
 pkgs/development/compilers/gnu-smalltalk/default.nix | 11 ++++++++---
 pkgs/top-level/all-packages.nix                      |  4 +++-
 2 files changed, 11 insertions(+), 4 deletions(-)

diff --git a/pkgs/development/compilers/gnu-smalltalk/default.nix b/pkgs/development/compilers/gnu-smalltalk/default.nix
index f001de2700da..5d9ca621648b 100644
--- a/pkgs/development/compilers/gnu-smalltalk/default.nix
+++ b/pkgs/development/compilers/gnu-smalltalk/default.nix
@@ -1,5 +1,7 @@
 { stdenv, fetchurl, pkgconfig, libtool, zip, libffi, libsigsegv, readline, gmp,
-gnutls, gnome, cairo, SDL, sqlite }:
+gnutls, gnome, cairo, SDL, sqlite, emacsSupport ? false, emacs ? null }:
+
+assert emacsSupport -> (emacs != null);
 
 let # The gnu-smalltalk project has a dependency to the libsigsegv library.
     # The project ships with sources for this library, but deprecated this option.
@@ -26,9 +28,12 @@ in stdenv.mkDerivation rec {
   buildInputs = [
     pkgconfig libtool zip libffi libsigsegv-shared readline gmp gnutls gnome.gtk
     cairo SDL sqlite
-  ];
+  ]
+  ++ stdenv.lib.optional emacsSupport emacs;
 
-  configureFlags = [ "--without-emacs" ];
+  configureFlags = stdenv.lib.optional (!emacsSupport) "--without-emacs";
+
+  installFlags = stdenv.lib.optional emacsSupport "lispdir=$(out)/share/emacs/site-lisp";
 
   # For some reason the tests fail if executated with nix-build, but pass if
   # executed within nix-shell --pure.
diff --git a/pkgs/top-level/all-packages.nix b/pkgs/top-level/all-packages.nix
index b8daf0f6ec30..4eb921b84429 100644
--- a/pkgs/top-level/all-packages.nix
+++ b/pkgs/top-level/all-packages.nix
@@ -3574,7 +3574,9 @@ let
     inherit fetchurl stdenv;
   });
 
-  gnu-smalltalk = callPackage ../development/compilers/gnu-smalltalk { };
+  gnu-smalltalk = callPackage ../development/compilers/gnu-smalltalk {
+    emacsSupport = config.emacsSupport or false;
+  };
 
   gccgo = gccgo48;