include file help (anyone?)

[Merlyn (root)]

Perhaps someone can help me with a problem I am having using snavigator.
when I'm trying to work with include files that use the form 
#include <sys/stabs.h> for example (where a directory below the include
directory is used ..i.e let's say /usr/include) snavigator says (file not
found) now the file is there...and /usr/include is specified in the path for 
the include file search. so why doesn't it work?

if anyone can help I would great accpreciate it

thanks

merlyn