Help to hello_world example

[Matteo]

Hi

 I install rtems in /opt/rtems-4.6/ unpackaging the rpm file, I untar the
example and I would like to launch the hello_world  so I launch
/example/hello_world_c/make but I have a lot of error !

matteo at matteo:~/projects/rtems/examples-4.6.5/hello_world_c$ make
Makefile:33: /opt/rtems-4.6/bin/Makefile.inc: No such file or directory
Makefile:35: no file name for `include'
Makefile:36: /make/leaf.cfg: No such file or directory
make: *** No rule to make target `/make/leaf.cfg'.  Stop.
matteo at matteo:~/projects/rtems/examples-4.6.5/hello_world_c$

IT's a problem of PATH ?
What I can do ?

Thanks in advance