在安装yaf拓展时，使用到了phpize，在执行 phpize 时会出现以下报错
Cannot find autoconf. Please check your autoconf installation and the
$PHP_AUTOCONF environment variable. Then, rerun this script.
初次使用 phpize 需要 安装 autoconf
请按照下面的安装顺序，依次安装。
##安装m4
curl -O http://mirrors.kernel.org/gnu/m4/m4-1.4.13.tar.gz tar -xzvf m4-1.4.13.tar.gz cd m4-1.4.13 ./configure --prefix=/usr/local make sudo make install
##安装autoconf
cd .. curl -O http://mirrors.kernel.org/gnu/autoconf/autoconf-2.65.tar.gz tar -xzvf autoconf-2.65.tar.gz cd autoconf-2.65 ./configure --prefix=/usr/local # ironic, isn't it? make sudo make install
##安装automake
cd .. curl -O http://mirrors.kernel.org/gnu/automake/automake-1.11.tar.gz tar xzvf automake-1.11.tar.gz cd automake-1.11 ./configure --prefix=/usr/local make sudo make install
##安装libtool
cd .. curl -O http://mirrors.kernel.org/gnu/libtool/libtool-2.2.6b.tar.gz tar xzvf libtool-2.2.6b.tar.gz cd libtool-2.2.6b ./configure --prefix=/usr/local make sudo make install