title: ocaml command line cannot not find "topfind"
body: <p>I have top-level installed, and have $OCAML_TOPLEVEL_PATH setup.</p>
  
  <pre><code>export OCAML_TOPLEVEL_PATH=/Users/smcho/.opam/system/lib/toplevel
  </code></pre>
  
  <p>I checked that the directory exists, and has one file <code>topfind</code>. </p>
  
  <p>This is my <code>~/.ocamlinit</code> file content.</p>
  
  <pre><code>#use "topfind"
  #camlp4o
  #thread
  #require "core.top"
  #require "core.syntax"
  </code></pre>
  
  <p>The issue is that I have the error message saying it can't find topfind. </p>
  
  <pre><code>&gt; ocaml
          OCaml version 4.02.1
  
  Cannot find file topfind.
  Unknown directive `camlp4o'.
  # 
  </code></pre>
  
  <p>With "ustop", I have no error message.</p>
  
  <p>What might be wrong? </p>
  
  <p>This is my ocaml environment setup. </p>
  
  <pre><code>&gt; opam config env
  CAML_LD_LIBRARY_PATH="/Users/smcho/.opam/system/lib/stublibs:/usr/local/lib/ocaml/stublibs"; export CAML_LD_LIBRARY_PATH;
  OPAMUTF8MSGS="1"; export OPAMUTF8MSGS;
  MANPATH=":/Users/smcho/.opam/system/man"; export MANPATH;
  MAKELEVEL=""; export MAKELEVEL;
  MAKEFLAGS=""; export MAKEFLAGS;
  PERL5LIB="/Users/smcho/.opam/system/lib/perl5:"; export PERL5LIB;
  OCAML_TOPLEVEL_PATH="/Users/smcho/.opam/system/lib/toplevel"; export OCAML_TOPLEVEL_PATH;
  PATH="..."; export PATH;
  </code></pre>