PROJ API

[Oliver Madge]

I’m trying to build Survex and ran into the following error:

commands.c:38:10: fatal error: proj_api.h: No such file or directory
   38 | #include <proj_api.h>
      |          ^~~~~~~~~~~~
compilation terminated.

This is because Survex uses the (now very old) PROJ 4 API. I can see that
Survex defines ACCEPT_USE_OF_DEPRECATED_PROJ_API_H
which allowed use of the old API until PROJ 7 but this has now been
completely removed in PROJ 8 in favour of the PROJ 6 API.

Are there plans to migrate Survex to use the PROJ 6 API?

Thanks,
Olly