When building ncurses-5.9, we will always get a warning: WARNING: Failed to fetch URL ftp://invisible-island.net/ncurses/current/ncurses-5.9-20150329.tgz, attempting MIRRORS if available because the link no longer exists.
Sent patch to oe-core: http://lists.openembedded.org/pipermail/openembedded-core/2015-November/113328.html
http://git.yoctoproject.org/cgit/cgit.cgi/poky/commit/?id=598e372ab25f159d513b0a0fd2cd99275139824e
Verified: link removed. It seems the site maintainer will keep only a limited of newer versions. This problem can occur on other recipes as well.