From a brief look at the dependencies I noted two not small but needed items for KDb:

https://build.kde.org/job/Extragear%20kdb%20kf5-qt5%20SUSEQt5.9/30/consoleFull

04:12:33 -- Could NOT find MySQL (missing: MYSQL_LIBRARIES MYSQL_INCLUDE_DIR MYSQL_LIB_DIR)
04:12:33 -- Could NOT find PostgreSQL (missing: PostgreSQL_LIBRARY PostgreSQL_INCLUDE_DIR PostgreSQL_TYPE_INCLUDE_DIR)

KDb is this highly stripped down in scope only to SQLite support. Do you know how these can be provided?

• MySQL client libraries, can be replaced by MariaDB client libs if this is preferred
• PostgreSQL client libraries

(no actual server instances are needed now although in the future we might have autotests that require access to them)