./autogen.sh: 9: ./autogen.sh: a

执行./autogen.sh
出现:
./autogen.sh: 9: ./autogen.sh: aclocal: not found
./autogen.sh: 10: ./autogen.sh: autoheader: not found
./autogen.sh: 11: ./autogen.sh: automake: not found
./autogen.sh: 12: ./autogen.sh: autoconf: not found

解决办法:
执行:
$ sudo apt-get install automake
$ sudo apt-get install autoconf

https://stackoverflow.com/questions/33592197/how-to-install-facebook-watchman-on-ubuntu