qscintilla-qt5 from X11:LXQt project
Select Your Operating System
Add repository and install manually
For openSUSE Tumbleweed run the following as root:
zypper addrepo https://download.opensuse.org/repositories/X11:LXQt/openSUSE_Tumbleweed/X11:LXQt.repo zypper refresh zypper install qscintilla-qt5