Umbrello build failure

[Jonathan Riddell]

Ralf, I'm seeing build failures in Umbrello introduced by your commit of
March 12

6c475a1037ddbb51650e70d72582c94dbaac7ce9

https://build.neon.kde.org/job/bionic_stable_kde_umbrello_bin_amd64/175/consoleFull

*00:23:36* CMake Error at
/usr/share/cmake-3.10/Modules/FindDoxygen.cmake:542
(elseif):*00:23:36*   given arguments:*00:23:36* *00:23:36*     "NOT"
"doxygen" "IN_LIST" "Doxygen_FIND_COMPONENTS"*00:23:36* *00:23:36*
Unknown arguments specified*00:23:36* Call Stack (most recent call
first):*00:23:36*   CMakeLists.txt:238 (find_package)

Jonathan
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