New formula: getopt

The GNU version of getopt, required for tools like xmlto.

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

* Renamed formula to "gnu-getopt" since it shadows the BSD getopt
* Made keg-only for same reason as above

Formula/gnu-getopt.rb

@@ -0,0 +1,22 @@
+require 'formula'
+
+class GnuGetopt <Formula
+  url 'http://software.frodo.looijaard.name/getopt/files/getopt-1.1.4.tar.gz'
+  md5 '02188ca68da27c4175d6e9f3da732101'
+  homepage 'http://software.frodo.looijaard.name/getopt/'
+
+  depends_on 'gettext'
+
+  def keg_only?
+    :provided_by_osx
+  end
+
+  def install
+    inreplace 'Makefile' do |s|
+      gettext = Formula.factory 'gettext'
+      s.change_make_var! "CPPFLAGS", "\\1 -I#{gettext.include}"
+      s.change_make_var! "LDFLAGS", "\\1 -L#{gettext.lib} -lintl"
+    end
+    system "make", "prefix=#{prefix}", "mandir=#{man}", "install"
+  end
+end