OPAM: add head, clarify caveats

Closes #17743.

Signed-off-by: Jack Nagel <jacknagel@gmail.com>

1 files changed, 10 insertions, 4 deletions

diff --git a/Library/Formula/opam.rb b/Library/Formula/opam.rb
index f11c6646d..a8804bc13 100644
--- a/Library/Formula/opam.rb
+++ b/Library/Formula/opam.rb
@@ -5,6 +5,8 @@ class Opam < Formula
   url 'https://github.com/OCamlPro/opam/archive/0.9.2.tar.gz'
   sha1 '993ad778101589bbad089e34922d0e60180698a0'
 
+  head 'https://github.com/OCamlPro/opam.git'
+
   depends_on "objective-caml"
 
   def install
@@ -21,14 +23,18 @@ class Opam < Formula
   end
 
   def caveats; <<-EOS.undent
-    OPAM uses ~/.opam by default to install packages, so you need to initialize
-    the package database first by running (as a normal user):
+    OPAM uses ~/.opam by default for its package database, so you need to
+    initialize it first by running (as a normal user):
 
     $  opam init
 
-    and add the following line to ~/.profile to initialize the environment:
+    Run the following to initialize your environmnent variables:
+
+    $  eval `opam config env`
 
-    $  eval `opam config -env`
+    To export the needed variables every time, add them to your dotfiles.
+      * On Bash, add them to `~/.bash_profile`.
+      * On Zsh, add them to `~/.zprofile` instead.
 
     Documentation and tutorials are available at http://opam.ocamlpro.com, or
     via 'man opam' and 'opam --help'.