QB64 to set a DOS errorlevel code

How can QB64 set a DOS errorlevel code upon exiting?
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I am trying to convert a QB45 program, Seamenu.Bas, to QB64,
but cannot get it to compile. Seamenu.Bas runs under a batch
file which calls upon Seamenu.Bas to place a menu on screen
and waits until user presses a key. Seamenu.Bas then exits
and emits a DOS errorcode. If you click below to link to
SEAMENU.BAS, a sample batch file, MainMenu.Bat, is located
at the end of the main program of SEAMENU.BAS with (')
apostrophes placed before each line.

At one time, to exit a program with an DOS errorlevel number,
I used Ethan Winer's PRO.LIB's CALL SetLevel(ExitCode%).
Then, I learned how to do this in pure QB4.5 code, like this:
==================================================
DECLARE SUB Bye CDECL ALIAS "_exit" (BYVAL Selection%)
'
'
what.choice:
IF Selection% > 0 THEN
CALL Bye(Selection%)
END IF
SYSTEM
===================================================
When I attempt to compile my SEAMENU.BAS program with QB64
I get following error:
..
Expected CALL sub-name [(...)]
Caused by (or after)" CALL BYE ( SELECTION% )
LINE 203:CALL Bye(Selection%)
===================================================
I looked at QB64's _CLIPBOARD$ (function), _CLIPBOARD$ (statement)
and _DONTWAIT (SHELL action), but they didn't work for me.
===================================================

Link to SEAMENU.BAS here:
http://www.smithselfgen.com/QuickBasic/SEAMENU.BAS

Link to SEAMENU.ZIP here:
http://www.smithselfgen.com/QuickBasic/SEAMENU1.ZIP

Regards to all, Don Smith

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