loudmouth: default to OpenSSL intead of GnuTLS

Closes Homebrew/homebrew#20879.

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

Formula/loudmouth.rb

@@ -6,9 +6,11 @@ class Loudmouth < Formula
   version '1.5.0.20121201'
   sha1 '502963c3068f7033bb21d788918c1e5cd14f386e'
 
+  option 'with-gnutls', "Use GnuTLS instead of the default OpenSSL"
+
   depends_on 'pkg-config' => :build
   depends_on 'glib'
-  depends_on 'gnutls'
+  depends_on 'gnutls' => :optional
   depends_on 'libidn'
 
   # Fix compilation on 10.9. Sent upstream:
@@ -16,9 +18,15 @@ class Loudmouth < Formula
   def patches; DATA; end
 
   def install
-    system "./configure", "--disable-debug",
-                          "--disable-dependency-tracking",
-                          "--prefix=#{prefix}"
+    args = ["--disable-debug",
+            "--disable-dependency-tracking",
+            "--prefix=#{prefix}"]
+    if build.with? 'gnutls'
+     args << "--with-ssl=gnutls"
+    else
+     args << "--with-ssl=openssl"
+    end
+    system "./configure", *args
     system "make install"
   end
 end