我已经在HOME的地方建立了.vimrc
里面打了一行 set tags=./tags,../tags
但是当我make ctags的时候
Tagging cmd...
/bin/sh: 4: ctags: not found
Tagging calc...
/bin/sh: 4: ctags: not found
Tagging util...
/bin/sh: 4: ctags: not found
Tagging main...
/bin/sh: 1: ctags: not found
make: *** [ctags] Error 127
请问是哪里搞错了吗??