Trying to load responder has brought up a dependency issue. When it is invoked responder wants to load Git, but it is no longer available at the path that is being called by opkg.
root@turtle:/etc/turtle/modules# opkg update > /dev/null && opkg install git
* opkg_download: Failed to download http://downloads.openwrt.org/chaos_calmer/15.05.1/ar71xx/generic/packages/oldpackages/Packages.gz, wget returned 8.
* opkg_download: Failed to download http://downloads.openwrt.org/chaos_calmer/15.05.1/ar71xx/generic/packages/oldpackages/Packages.sig,