Libc questions for development with SGI compiler

[Steph Hannon <hannon@Crissy.Stanford.EDU>]

I am trying to use the newly developed compiler for SGI.  I am a little 
confused about which libraries I should be using.  I initially thought that

libc-4.6.27.tar.gz

was the correct set but it doesn't contain stdlib.h, file.h and many others.  I 
know I am missing something basic, but I am new to this game :)  Can someone 
tell me what libraries I should be using and where I can get them.

Thank you in advance,

Steph