A modified version of the homebrew freetds formula with support added for gnutls as an alternative (?) to openssl -- *? using the `--with-gnutls` switch seems to disable openssl support

freetds_with_gnutls.rb

class Freetds < Formula
  desc "Libraries to talk to Microsoft SQL Server and Sybase databases"
  homepage "http://www.freetds.org/"
  url "ftp://ftp.freetds.org/pub/freetds/stable/freetds-1.00.9.tar.bz2"
  mirror "https://fossies.org/linux/privat/freetds-1.00.9.tar.bz2"
  sha256 "3a91ce6321ac3c951281ce908f3eae40a0b6d1101b3322cac0602f62c006cb6c"

  bottle do
    sha256 "934404b4fbc59469df94f6ed71887fc75a7c69556c64cad024d478be3de85e7c" => :el_capitan
    sha256 "b753cb2b0a6e4a09f27e2852cc60bfc8ee90c5e5e48c5c466ae87df6190bcb57" => :yosemite
    sha256 "ba3bf56066734fab273678717176ee5b8dc4d98883e1a962f51b8e13d0a145ab" => :mavericks
  end

  head do
    url "https://github.com/FreeTDS/freetds.git"

    depends_on "autoconf" => :build
    depends_on "automake" => :build
    depends_on "gettext" => :build
    depends_on "libtool" => :build
  end

  option :universal
  option "with-gnutls", "Enable SSL using GnuTLS. Use version 1.2.3 or newer."
  option "with-msdblib", "Enable Microsoft behavior in the DB-Library API where it diverges from Sybase's"
  option "with-sybase-compat", "Enable close compatibility with Sybase's ABI, at the expense of other features"
  option "with-odbc-wide", "Enable odbc wide, prevent unicode - MemoryError's"
  option "with-krb5", "Enable Kerberos support"

  deprecated_option "enable-msdblib" => "with-msdblib"
  deprecated_option "enable-sybase-compat" => "with-sybase-compat"
  deprecated_option "enable-odbc-wide" => "with-odbc-wide"
  deprecated_option "enable-krb" => "with-krb5"

  depends_on "pkg-config" => :build
  depends_on "unixodbc" => :optional
  depends_on "gnutls" => :optional
  depends_on "openssl" => :recommended

  def install
    args = %W[
      --prefix=#{prefix}
      --with-tdsver=7.3
      --mandir=#{man}
    ]

    if build.with? "gnutls"
      args << "--with-gnutls"
    end

    if build.with? "openssl"
      args << "--with-openssl=#{Formula["openssl"].opt_prefix}"
    end

    if build.with? "unixodbc"
      args << "--with-unixodbc=#{Formula["unixodbc"].opt_prefix}"
    end



    # Translate formula's "--with" options to configuration script's "--enable"
    # options
    %w[msdblib sybase-compat odbc-wide krb5].each do |option|
      if build.with? option
        args << "--enable-#{option}"
      end
    end

    ENV.universal_binary if build.universal?

    if build.head?
      system "./autogen.sh", *args
    else
      system "./configure", *args
    end
    system "make"
    ENV.j1 # Or fails to install on multi-core machines
    system "make", "install"
  end

  test do
    system "#{bin}/tsql", "-C"
  end
end