-=> Dave Kelly wrote to All <=-

 DK>     struct {
 DK>         char addr[3],
 DK>              size[2];
 DK>     } fdseg[48];
 ...
 DK> struct fdseg {
 DK>    char addr[3];
 DK>    char size[2];
 DK> };
 ...
 DK>    OutputSegList( segs, (SegList)&(FDPtr->fdseg));

Could it be that your compiler is confused by this dual usage of "fdseg"?
I'd suggest changing one of the identifiers to something else.

... I haven't lost my mind; it's backed up on tape somewhere!
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