The build fails with:
CMake Error at Common/Core/CMakeLists.txt:442 (check_symbol_exists): Unknown CMake command "check_symbol_exists".
The fix is to add:
However should this be added to the top level CmakeLists.txt?
@ben.boeckel I’ll let you make the decision since you are really familiar with the CMake files in VTK! Not sure why this issue pops up in CMake 3.15 but not earlier versions of CMake.