The definition of `SET_VARSIZE` and `VARSIZE` were moved from `postgres.h` to `varatt.h` in Postgres v16. https://github.com/tanglebones/pg_tuid/blob/c3d9a7f20486a188bfff8490c78bd3f7e3c3b5b4/pg_c/tuid.c#L4
The definition of
SET_VARSIZEandVARSIZEwere moved frompostgres.htovaratt.hin Postgres v16.pg_tuid/pg_c/tuid.c
Line 4 in c3d9a7f