HP-UX 11i compile failures

[Albert Chin <nautilus-list lists thewrittenword com>]

Attempting to build 2.0.7 with the HP C compiler on 11i:
cc: "nautilus-directory-async.c", line 1232: error 1721: Operands for
< must be of arithmetic type or pointers to compatible types.
cc: "nautilus-directory-async.c", line 1232: error 1563: Expression in
if must be scalar.
cc: "nautilus-directory-async.c", line 1235: error 1721: Operands for
> must be of arithmetic type or pointers to compatible types.
cc: "nautilus-directory-async.c", line 1235: error 1563: Expression
> in if must be scalar.
cc: "nautilus-directory-async.c", line 1239: error 1721: Operands
> for < must be of arithmetic type or pointers to compatible types.
cc: "nautilus-directory-async.c", line 1239: error 1563: Expression
> in if must be scalar.
cc: "nautilus-directory-async.c", line 1242: error 1721: Operands
> for > must be of arithmetic type or pointers to compatible types.
cc: "nautilus-directory-async.c", line 1242: error 1563: Expression
> in if must be scalar.
gmake[2]: *** [nautilus-directory-async.lo] Error 1
gmake[2]: Leaving directory
`/opt/build/nautilus-2.0.7/libnautilus-private'

Problematic code:
                if (callback_a->callback.directory < callback_b->callback.directory) {
                        return -1;
                }
                if (callback_a->callback.directory > callback_b->callback.directory) { 
                        return 1;
                }

Should I cast to fix?

-- 
albert chin (china thewrittenword com)