spawnp in rpg

All,

I'm trying to use spawnp in an rpg pgm.  I'm having trouble with the
environment path (the 6th parm)

If I set the environment using ADDENVVAR or by calling
putenv('PATH=%LIBL%') then it works.  But if I try to set the environment
path in the rpg pgm by passing it as an argument to spawnp then it fails.

     D envpath         s            100    varying
     D envpathp        s               *   dim(2)

       envpath = 'PATH=%LIBL%'+x'00';
       envpathp(1) = %addr(envpath);
       envpathp(2) = *null;

Am I coding this incorrectly?

Thanks,
Phil