What does it mean for buildapache application uses the MySQL libraries and headers on the server its

MySQL or MariaDB Upgrade - Version 78 Documentation - cPanel Documentation sez: [quote]If the buildapache application uses the MySQL libraries and headers on the server itself, and you change the MySQL version, Apache cannot function correctly.
What is the buildapache application? By 'MySQL libraries and headers on the server itself' do they mean building Apache so that it uses MySQL internally? Would httpd be linked to libmysql.so if this were the case?