I wonder when someone says that an issue is fixed without giving all the needed informations to succeed on building.
The Viktor suggestion is right, the fix works.
As you see, the build proceed in Linux flavour and not in Android one, and the log library is linked by gcc, not by clang.
So, what is missing in changelog and in readme.md is the need to set two environmental variables:
HB_COMPILER="gcc"
HB_PLATFORM="android"
After exporting this variables all works flawlessy.
Thanks to Antonio and Viktor, whose suggestions have opened up a new opportunity for development in Harbor.
Have a nice Sunday.
Best regards.
--
Maurizio