The findutils source distribution contains two different implementations of
find. The older implementation descends the file system
recursively, while the newer one uses fts. Both are normally
installed.
If the option --without-fts was passed to configure, the
recursive implementation is installed as find and the fts-based
implementation is installed as ftsfind. Otherwise, the
fts-based implementation is installed as find and the recursive
implementation is installed as oldfind.