https://www.apt-browse.org/browse/ubuntu/trusty/main/amd64/php5-dev/5.5.9+dfsg-1ubuntu4/file/usr/include/php5/ext/mbstring/libmbfl/mbfl/mbfl_filter_output.h
/usr/include/php5/ext/mbstring/libmbfl/mbfl/mbfl_filter_output.h
filter outputusrincludeextmbstring
https://bugs.php.net/bug.php?id=68504&edit=1
PHP :: Request #68504 :: --with-libmbfl configure option not present on Windows
phprequest