最初から入ってるctagsは「-R」が使えない(Exuberant Ctagsじゃない)
MacPortsでExuberant Ctagを入れること
# /usr/bin/ctags --help /usr/bin/ctags: illegal option -- - usage: ctags [-BFadtuwvx] [-f tagsfile] file ... # # /usr/local/bin/ctags --version Exuberant Ctags 5.7J1, Copyright (C) 1996-2007 Darren Hiebert Compiled: Jun 1 2008, 22:25:30 Addresses: <dhiebert@users.sourceforge.net>, http://ctags.sourceforge.net Japanese patch by Hirohito Higashi <h_east@pop11.odn.ne.jp> http://hp.vector.co.jp/authors/VA025040/ Optional compiled features: +wildcards, +regex, +kanji