【排坑】Cannot find autoconf.

> /php/bin/phpize
Configuring for:
PHP Api Version:         20170718
Zend Module Api No:      20170718
Zend Extension Api No:   320170718
Cannot find autoconf. Please check your autoconf installation and the
$PHP_AUTOCONF environment variable. Then, rerun this script.

brew介绍

> brew install autoconf
==> Downloading https://homebrew.bintray.com/bottles/autoconf-2.69.high_sierra.bottle.4.tar.gz
######################################################################## 100.0%
==> Pouring autoconf-2.69.high_sierra.bottle.4.tar.gz
==> Caveats
Emacs Lisp files have been installed to:
  /usr/local/share/emacs/site-lisp/autoconf
==> Summary
  /usr/local/Cellar/autoconf/2.69: 71 files, 3.0MB