gcc's ANSI include files

[Ken-Huang Lin]

We installed gcc 1.37.1 on Vax station II and DEC station 3100 running
Ultrix 3.1 recently. The compiler doesn't recognize ANSI standard
include file "stdlib.h", nor does it have the standard string function
"strstr". The error messages are:
  stdlib.h: No such file or directory
for the former, and
  Undefined:
  _strstr
for the latter, even when I add "-ansi" option in the compiling.

Any help would be much appreciated,
 
Ken H. Lin
khlin at uiwpl.ece.uiuc.edu