5.6.30+dfsg-0+deb8u1
) is not available, but a newer one is (5.6.33+dfsg-0+deb8u1
). We redirected you there.
/usr/lib/php5/build/config.guess is in php5-dev 5.6.33+dfsg-0+deb8u1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/php5/build/../../../share/misc/config.guess