🚀 go-pugleaf

   I ran into sort of the same problem as you.  It turns out that AC_CLOSE is
defined as two different numbers in two different places; as best as I
remember, you have to go into one of the ".h" files Atari supplied you and
change the #define line to what the GEM documentation says it is.  Or else
you have to go ignore the GEM docs and use the number supplied with the ".h"
file.  Once you get the value set uyp correctly, just do what it says in the
GEM docs.
   Oh yeah!  I just realized that since you have the Lattice C, you don't
have the Atary ".h" files...oops...as I remember, the correct value of
AC_CLOSE is either:
   30
   31
   40
 or
   41
(or POSSIBLY 0x30, 0x31, etc...but probably decimal).
   Sorry I couldn't be of more help.