igraph 0.6.5

Closes Homebrew/homebrew#19818.

Signed-off-by: Adam Vandenberg <flangy@gmail.com>

Formula/igraph.rb

@@ -0,0 +1,16 @@
+require 'formula'
+
+class Igraph < Formula
+  homepage 'http://igraph.sourceforge.net/'
+  url 'http://downloads.sourceforge.net/project/igraph/C%20library/0.6.5/igraph-0.6.5.tar.gz'
+  sha1 'f1605c5592e8bf3c97473f7781e77b6608448f78'
+
+  depends_on 'gmp' => :build
+
+  def install
+    system "./configure", "--disable-debug", "--disable-dependency-tracking",
+                          "--prefix=#{prefix}"
+    system "make"
+    system "make", "install"
+  end
+end