I think the same problem exists for Europe/Belfast
A Link line for it is in file backwards, but this is not compiled by default, so that no binary Europe/Belfast gets created.

Adding a Link line in file europe would fix that.
Link    Europe/London        Europe/Belfast

On 16.08.19 14:22, Alois Treindl wrote:

I think file asia should have a line

Link    Asia/Bangkok Asia/Hanoi

If this is absent, and file backzone is not compiled, no binary file for Hanoi gets created.
This breaks all references to it.

For all other zones in backzone, a Link line exists so that a binary file is always created.