Ruby Enterprise Edition depends on readline for unicode support.

(For reference, the Ruby 1.9 formula also depends on readline.)

This fixes Homebrew/homebrew#882.

Formula/ruby-enterprise-edition.rb

@@ -5,6 +5,8 @@ class RubyEnterpriseEdition <Formula
   md5 '587aaea02c86ddbb87394a340a25e554'
   homepage 'http://rubyenterpriseedition.com/'
 
+  depends_on 'readline'
+
   skip_clean 'bin/ruby'
 
   aka :ree
@@ -12,13 +14,12 @@ class RubyEnterpriseEdition <Formula
   def install
     ENV.gcc_4_2 # fails with LLVM
     args = ['./installer', "--auto", prefix, '--no-tcmalloc']
-    args.push('-c --enable-shared') if ARGV.include?('--enable-shared')
+    args << '-c' << '--enable-shared' if ARGV.include?('--enable-shared')
     system *args
   end
 
   def caveats; <<-EOS.undent
     By default we don't compile REE as a shared library. From their documentation:
-
         Please note that enabling --enable-shared will make the Ruby interpreter
         about 20% slower.
 
@@ -26,7 +27,6 @@ class RubyEnterpriseEdition <Formula
     acceptable and even desirable.
 
     If you need REE to be compiled as a shared library, you can re-compile like so:
-
         brew install ruby-enterprise-edition --force --enable-shared
     EOS
   end