in openSUSE, we're currently dropping the last packages still having a dependency on QtWebKit. In kdevelop 5.6.2 and master, this dependency can't be skipped on platforms where QtWebEngine is not available (PPC, zSystems). The KDev::Documentation target also can't be skipped on these platforms since it's required by other ones (KDevPlatformShell, kdevqthelp, kdevmanpage, kdevcmakedocumentation)
This dependency is gone with the Qt 6 port.