New formula: libp11 0.2.8

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

Formula/libp11.rb

@@ -0,0 +1,21 @@
+require 'formula'
+
+class Libp11 < Formula
+  homepage 'https://github.com/OpenSC/libp11/wiki'
+  url 'http://sourceforge.net/projects/opensc/files/libp11/libp11-0.2.8.tar.gz'
+  sha1 '2d1f6dc4200038f55a0cb7e22858f93e484b0724'
+
+  head 'https://github.com/OpenSC/libp11.git'
+
+  depends_on 'pkg-config' => :build
+  depends_on :libltdl
+
+  depends_on :automake if build.head?
+
+  def install
+    system "./bootstrap" if build.head?
+    system "./configure", "--disable-dependency-tracking",
+                          "--prefix=#{prefix}"
+    system "make install"
+  end
+end