Article 143275 of comp.os.vms:
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From: Dave Rathnow <drath@dev.hcsd.hac.ca>
Newsgroups: comp.os.vms
Subject: Re: Return codes for MAIL$ routine
Date: Thu, 21 Mar 1996 14:48:09 -0800
Organization: Hughes Aircraft of Canada Ltd.
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Message-ID: <3151DCA9.62C6@dev.hcsd.hac.ca>
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I dont know if this got out so I'm reposting it.....

I've run into this problem before and found sometimes there is
no compiler upgrade that will give me the symbols I need.
The reason being that VMS changes/enhancements haven't filtered down
to the language teams yet.  You can either extract the symbolic names
from STARLET or LIB macro libraries and create your own include
files or do this:
 
Using MAILMSGDEF as the example:
 
1.  Create a macro file that looks like this:
 
        .title          /Stuff not in H files/
 
        .library        /sys$library:starlet.mlb/
        .library        /sys$library:lib.mlb/           !Optional but you can add more stuff
 
        $MAILMSGDEF     GLOBAL
 
        .end.
 
   Call this file MYLIB.MAR
 
2. In your C file, add this:
 
           .
           .
        #ifndef MAIL$_NOEXIST
        globalvalue unsigned long int MAIL$_NOEXIST
        #endif
           .
           .
          etc
 
   Let's call this MYC.C
 
3. Link'em all together:
 
        $MAC MYLIB
        $CC MYC
        $LINK MYC,MYLIB
 
You can use this technique for anything define in STARLET or LIB.  Useful
for getting at other thing in OVMS land.....For the most part you can use
the GLOBALVALUE symbols anywhere you use the #defines.  There ARE exceptions
though (eg: switch statements)

Cheers,
Dave.

-- 
Dave Rathnow                    |
Hughes Aircraft of Canada Ltd.  | "A modern day warrior is someone
Richmond, B.C., Canada          |  who takes up the challange of living..."
drath@dev.hcsd.hac.ca           |