php7.0 install faild

[BenVim]

./php_protocolbuffers.h:46:10: fatal error: 'ext/standard/php_smart_str.h' file not found

[guanhui07]

`In file included from /data/tmp/php-protocolbuffers/protocolbuffers.h:34:0, from /data/tmp/php-protocolbuffers/protocolbuffers.c:32: /data/tmp/php-protocolbuffers/php_protocolbuffers.h:46:40: fatal error: ext/standard/php_smart_str.h: No such file or directory

include "ext/standard/php_smart_str.h"

                                    ^

compilation terminated. make: *** [protocolbuffers.lo] Error 1`

got the same error