Add 6tunnel.

http://toxygen.net/6tunnel/

component/6tunnel/buildout.cfg

+# 6tunnel - Tunnelling for application that don't speak IPv6
+# http://toxygen.net/6tunnel/
+
+[buildout]
+parts = 6tunnel
+extends =
+  ../autoconf/buildout.cfg
+  ../automake/buildout.cfg
+
+[6tunnel]
+recipe = hexagonit.recipe.cmmi
+url = http://toxygen.net/6tunnel/6tunnel-0.11rc2.tar.gz
+md5sum = 74e02d4f0704b3083a01feda66033449
+configure-command =
+  aclocal-1.11
+  autoheader
+  automake-1.11 --foreign
+  autoconf
+  ./configure
+configure-options =
+  --prefix=${buildout:parts-directory}/${:_buildout_section_name_}
+environment =
+  PATH=${autoconf:location}/bin:${automake-1.11:location}/bin:%(PATH)s