CMake : Could NOT find Qt5FontDatabaseSupport

Question

I got the following error after running cmake for this :

Could NOT find Qt5FontDatabaseSupport (missing:
Qt5FontDatabaseSupport_LIBRARY Qt5FontDatabaseSupport_INCLUDE_DIR) (found
version "5.12.8")

I cannot find any package with that name in my linux repository.
That is one of the dependencies for the Qt QPA plugin, as stated in the CMakeLists.txt comments.

I use Kubuntu 20.04 with cmake 3.16 and Qt 5.12.

Thanks.

Answer 1

Most likely you don't have the build dependencies installed. Qt5FontDatabaseSupport is part of the gui Qt module, for which the headers and devel files are installed with the qtbase5-dev package. Kwin has many more build dependencies than qtbase, so the best if you install all of them with:

sudo apt build-dep kwin

at once, or with

sudo apt build-dep kwin-wayland

if you want to hack it under wayland.