+Starting with ncurses 5.6 patch 20070113, this program can be built
+outside the ncurses source-tree, provided that ncurses is configured
+using the "--with-ticlib" option. That makes available the private
+interfaces used by tack, and eliminates the need to distribute tack
+as an optional part of ncurses.
+
+Unlike the rest of ncurses, the 'tack' program is covered under the GNU