With ports r508239 the port has been marked as not broken with MySQL 8.0. But the problem still exists and has not been fixed. (See also: bug #230538)

Build Error from yesterday:
===========================================================================
=======================<phase: package        >============================
===>  Building package for apr-1.7.0.1.6.1
pkg-static: Unable to access file /wrkdirs/usr/ports/devel/apr1/work/stage/usr/local/lib/apr-util-1/apr_dbd_mysql-1.so:No such file or directory
pkg-static: Unable to access file /wrkdirs/usr/ports/devel/apr1/work/stage/usr/local/lib/apr-util-1/apr_dbd_mysql.a:No such file or directory
pkg-static: Unable to access file /wrkdirs/usr/ports/devel/apr1/work/stage/usr/local/lib/apr-util-1/apr_dbd_mysql.so:No such file or directory
*** Error code 1

Stop.
make: stopped in /usr/ports/devel/apr1
-----------
What i also saw in the build log:
configure: checking for mysql in /usr/local
checking for mysql.h... no
checking for mysql/mysql.h... no

Thanks for taking a look at it.