Switched PHP release versions, now update-error with CustomBuild

After changing the values in options.conf, I did do "./build php d (or 'n')".
Should I try building PHP again?

Or should Apache be rebuild as well also, before php?

Also, I think I could by now also get rid of the 2nd (php5.6) all together as all the domains have been running on php7.1 for a number of time without issues anymore.

I'm still dealing with a mismatched Imagick-install which throws a Notice, so losing the 2nd PHP-install could simplify trouble shooting perhaps.