nmap requires newer openssl on Leopard

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

Formula/nmap.rb

@@ -5,11 +5,21 @@ class Nmap <Formula
   homepage 'http://nmap.org/5/'
   md5 'a4df96e52cb52a1bbe76caace5f21388'
 
+  # namp needs newer version of openssl on Leopard
+  depends_on "openssl" if MACOS_VERSION < 10.6
+
   def install
     fails_with_llvm
     ENV.deparallelize
 
-    system "./configure", "--prefix=#{prefix}", "--without-zenmap"
+    args = ["--prefix=#{prefix}", "--without-zenmap"]
+
+    if MACOS_VERSION < 10.6
+      openssl = Formula.factory('openssl')
+      args << "--with-openssl=#{openssl.prefix}"
+    end
+
+    system "./configure", *args
     system "make" # seperate steps required otherwise the build fails
     system "make install"
   end