From 4f1aefb1ee78c09541f744d70b6721773bd58596 Mon Sep 17 00:00:00 2001
From: Mike Morearty
Date: Thu, 13 Jun 2013 00:59:13 -0700
Subject: Elixir: Show warning if Erlang R16 isn't installed

Closes #20459.

Signed-off-by: Adam Vandenberg <flangy@gmail.com>
---
 Library/Formula/elixir.rb | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

(limited to 'Library/Formula')

diff --git a/Library/Formula/elixir.rb b/Library/Formula/elixir.rb
index beb1ad8f8..dfdf19a8f 100644
--- a/Library/Formula/elixir.rb
+++ b/Library/Formula/elixir.rb
@@ -3,7 +3,12 @@ require 'formula'
 class ErlangInstalled < Requirement
   fatal true
 
-  satisfy { which 'erl' }
+  satisfy {
+    which 'erl' and begin
+      `erl -noshell -eval 'io:fwrite("~s~n", [erlang:system_info(otp_release)]).' -s erlang halt | grep -q '^R1[6789]'`
+      $?.exitstatus == 0
+    end
+  }
 
   def message; <<-EOS.undent
     Erlang R16 is required to install.
-- 
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