lean: add wrapper for linja

pkgs/applications/science/logic/lean/default.nix

@@ -1,5 +1,5 @@
 { stdenv, fetchFromGitHub, cmake, gmp, mpfr, luajit, boost, python
-, gperftools, ninja }:
+, gperftools, ninja, makeWrapper }:
 
 stdenv.mkDerivation rec {
   name = "lean-${version}";
@@ -12,7 +12,7 @@ stdenv.mkDerivation rec {
     sha256 = "1gr024bly92kdjky5qvcm96gn86ijakziiyrsz91h643n1iyxhms";
   };
 
-  buildInputs = [ gmp mpfr luajit boost cmake python gperftools ninja ];
+  buildInputs = [ gmp mpfr luajit boost cmake python gperftools ninja makeWrapper ];
   enableParallelBuilding = true;
 
   preConfigure = ''
@@ -22,6 +22,10 @@ stdenv.mkDerivation rec {
 
   cmakeFlags = [ "-DCMAKE_BUILD_TYPE=Release" ];
 
+  postInstall = ''
+    wrapProgram $out/bin/linja --prefix PATH : $out/bin:${ninja}/bin
+  '';
+
   meta = {
     description = "Automatic and interactive theorem prover";
     homepage    = "http://leanprover.github.io";