I'm making the postfix MTA which depends on some database packages(mariadb, postgresql,...). I'm building on the instructions of Beyond Linux Form Scratch (BLFS) but I fear if it is needed for the sever daemons to be running for the build. Also, I've also built and installed some such packages (cyrus sasl, open ldap, ...) before and I do fear if they are built with mariadb, postgresql and all. Please help!
Clarification from comments: I've already installed mariadb, postgresql, and now I'm moving to install the postfix mail agent. And, postfix has mariadb and postgresql as dependencies. Now, is it required for mysql server and postgresql server to be running so that that it could be included as a dependency in postfix?