Building Blender on Kubuntu 19.10

OpenMP is giving linking errors, you could track down which library contains GOMP_loop_nonmonotonic_dynamic_start and adjust values with the OpenMP_ prefix, such as OpenMP_gomp_LIBRARY in your CMakeCache.txt.
You could try toggling WITH_OPENMP_STATIC too.

Or if you’re starting out and not wanting to troubleshoot linking errors, disable WITH_OPENMP.