In file included from /usr/include/string.h:634:0,
                 from /tmp/php7.0-7.0.4/ext-build/main/php_config.h:2505,
                 from /tmp/php7.0-7.0.4/main/php.h:34,
                 from /tmp/php7.0-7.0.4/ext/mbstring/mbstring.c:52:
/tmp/php7.0-7.0.4/main/php_reentrancy.h:109:7: error: expected identifier or '(' before '__extension__'
 char *strtok_r(char *s, const char *delim, char **last);
       ^
Makefile:1346: recipe for target 'ext/mbstring/mbstring.lo' failed