alloca() on AIX 3.1 ?

[James Tizard]

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The title says it all. The man pages indicate that alloca() is available,
but I can't find it ! 
It certainly isn't in libc.a or (as the gdbm installation
implies) in libPW.a
Help !

TIA
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 _--_|\        James Tizard                             
/      \       Cognitive Psychology Laboratory
\_.-*._/       Psychology Department                    
      v        Flinders University of South Australia   
               psjmt at cc.flinders.edu.au