I am trying to install automake on MacOS using brew. From terminal I write, brew install automake says Warning: automake-1.15 already installed.
When I then try automake version it responds -bash: automake: command not found. I am using OS X El Capitan.
$ automake version
-bash: automake: command not found
$ brew install automake
Warning: automake-1.15 already installed
$ automake version
-bash: automake: command not found
The solution had to do with brew having failed to link the binary into the PATH. Un-linking and re-linking solved it.
What an infuriating problem! In a Docker situation,
It is so hard to get autoconf 1.15 working that we had to get the aid of a Grand Ultra Master Expert to investigate the issue and get it working on Mac. It then worked beautifully.
Later I happened to upgrade a Mac to High Sierra, it stopped working! Even though autoconf 1.15 working fine.
How to fix:
Short answer, I simply trashed the local repo, for goodness sake, and checked out the repo again.
It then worked fine!
It has something to do with the aclocal.m4 and similar files. I endlessly massaged them but nothing. Someone suggsted just scratching the repo and getting it again: everything then worked!
来源：https://stackoverflow.com/questions/41024838/macos-automake-command-not-found