ocamlbuild 0.9.2

Since Ocaml 4.03.0, ocamlbuild is no longer part of ocaml,
but is still required for other packages, so it is installed separately

Updated camlp4 to depend on ocamlbuild for compilation

Formula/camlp4.rb

@@ -14,6 +14,8 @@ class Camlp4 < Formula
   end
 
   depends_on "ocaml"
+  # since Ocaml 4.03.0, ocamlbuild is no longer part of ocaml
+  depends_on "ocamlbuild"
 
   def install
     # this build fails if jobs are parallelized

Formula/ocamlbuild.rb

@@ -0,0 +1,19 @@
+class Ocamlbuild < Formula
+  desc "Generic build tool for OCaml"
+  homepage "https://github.com/ocaml/ocamlbuild"
+  url "https://github.com/ocaml/ocamlbuild/archive/0.9.2.tar.gz"
+  sha256 "257a3961da1aa47deb3de8da238ebe1daf13a73efef2228f97a064a90f91c6bc"
+  head "https://github.com/ocaml/ocamlbuild.git"
+
+  depends_on "ocaml"
+
+  def install
+    system "make", "configure", "OCAMLBUILD_BINDIR=#{bin}", "OCAMLBUILD_LIBDIR=#{lib}"
+    system "make"
+    system "make", "install"
+  end
+
+  test do
+    assert_match version.to_s, shell_output("#{bin}/ocamlbuild --version")
+  end
+end