CLANG: Ubuntu clang version 12.0.0-3ubuntu1~21.04.2
It appears the fix done for mac's clang here: #388 is missing in the latest 'pro' version. This was one of the two errors that also applies to later Linux using clang.
The second was shadowing error in VoxelGraphEditor/Private/VoxelLandscapeGrassGraph.cpp on line 35 & 38. It didn't like that you called the variable CreateGraph as the public field in the class is ALSO called CreateGraph. So I just changed both line 35 & 38 to be: _CreateGraph like so:

CLANG: Ubuntu clang version 12.0.0-3ubuntu1~21.04.2
It appears the fix done for mac's clang here: #388 is missing in the latest 'pro' version. This was one of the two errors that also applies to later Linux using clang.
The second was shadowing error in
VoxelGraphEditor/Private/VoxelLandscapeGrassGraph.cppon line 35 & 38. It didn't like that you called the variableCreateGraphas the public field in the class is ALSO calledCreateGraph. So I just changed both line 35 & 38 to be:_CreateGraphlike so: