Hi Stepan, first of all, thank you very much for your insightful response. I appreciate that you've taken so much time to help me with this issue. I chose this approach to solve my doxygen problem:
> [2] You can avoid running your "html-local" within the distcheck. I'm glad that using this technique the 'distcheck' target still works for me. It is a particularly nice feature of Automake and I wouldn't have wanted to lose that. Thank you for your help, Peter