New formula libev

A full-featured and high-performance (see benchmark) event loop that is
loosely modelled after libevent, but without its limitations and bugs.
It is used, among others, in the GNU Virtual Private Ethernet and
rxvt-unicode packages, and in the Deliantra MORPG Server and Client.

Signed-off-by: David Höppner <0xffea@gmail.com>

* new commit message

Formula/libev.rb

@@ -0,0 +1,16 @@
+require 'formula'
+
+class Libev <Formula
+  url 'http://dist.schmorp.de/libev/libev-3.9.tar.gz'
+  homepage 'http://software.schmorp.de/pkg/libev.html'
+  md5 '40fe7d56d70db83cc0c22a6a68d87a96'
+
+  def install
+    system "./configure", "--disable-debug",
+                          "--disable-dependency-tracking",
+                          "--prefix=#{prefix}",
+                          "--enable-shared",
+                          "--mandir=#{man}"
+    system "make install"
+  end
+end