php扩展安装失败。

Question

 pecl install xhprof-betaWARNING: channel "pecl.php.net" has updated its protocols, use "pecl channel-update pecl.php.net" to updatedownloading xhprof-0.9.4.tgz ...Starting to download xhprof-0.9.4.tgz (842,077 bytes)..........................................................................done: 842,077 bytes11 source files, buildingrunning: phpizeConfiguring for:PHP Api Version:         20160303Zend Module Api No:      20160303Zend Extension Api No:   320160303/Library/Developer/CommandLineTools/usr/bin/m4:aclocal.m4:3117: cannot open `build/ax_check_compile_flag.m4': No such file or directoryautom4te: /usr/bin/m4 failed with exit status: 1ERROR: `phpize' failed怎么解决啊？安装不上这个扩展