In order to build KDE from source please update dependencies list for OPENSUSE TUMBLEWEED at https://community.kde.org/Guidelines_and_HOWTOs/Build_from_source/Install_the_dependencies with following entries: libqt5-qtbase-devel xcb-proto-devel libQt5QuickControls2-devel libXtst-devel libaccounts-qt5-devel libaccounts-glib-devel libsignon-qt5-devel alsa-devel sphinxbase-devel pocketsphinx-devel vlc-devel libsignon-glib-devel libtag-devel id3lib-devel libmad-devel pocketsphinx-devel vrpn-devel freecell-solver-devel twisted (python (2 || 3)?) and probably: qwt6-devel libqwt-qt5-6.
Please note that the Community Wiki is open to edit by anyone with an Identity account so you have the ability to make those changes yourself and they don't need to be made by one of us.