gforth: Install gforth.el & add meta-data.

pkgs/development/compilers/gforth/default.nix

@@ -1,10 +1,27 @@
 { stdenv, fetchurl, m4 }:
 
-stdenv.mkDerivation rec {
+let
-  name = "gforth-0.7.3";
+  version = "0.7.3";
+in
+stdenv.mkDerivation {
+  name = "gforth-${version}";
   src = fetchurl {
-    url = "http://ftp.gnu.org/gnu/gforth/gforth-0.7.3.tar.gz";
+    url = "http://ftp.gnu.org/gnu/gforth/gforth-${version}.tar.gz";
     sha256 = "1c1bahc9ypmca8rv2dijiqbangm1d9av286904yw48ph7ciz4qig";
   };
+
   buildInputs = [ m4 ];
-}
+
+  postInstall = ''
+    mkdir -p $out/share/emacs/site-lisp
+    cp gforth.el $out/share/emacs/site-lisp/
+  '';
+
+  meta = {
+    description = "The Forth implementation of the GNU project";
+    homepage = https://www.gnu.org/software/gforth/;
+    license = stdenv.lib.licenses.gpl3;
+    platforms = stdenv.lib.platforms.all;
+    maintainers = with stdenv.lib.maintainers; [ the-kenny ];
+  };
+}