[newbie] gcc can't find the header files

[Dana]

I installed gcc from the Mandrake 7.0 CD and the
header files were put into /usr/i386-glibc-linux/include/
but when I compile a C program I get an error saying
"Cannot find stdio.h". 

I have put /usr/i386-glibc-linux/include in my PATH
but it hasn't helped.which makes me wonder what the
PATH variable is doing anyway.

I have spent most of today on this and am throwing
in the towell. Any help will be appreciated.

Dana