poll.h is in both rtems and newlib
Summary
poll.h should only come from one place.
$ find tools rtems/cpukit/include/ -name poll*.h
tools/6/sparc-rtems6/include/sys/poll.h
tools/6/sparc-rtems6/include/poll.h
rtems/cpukit/include/poll.h
rtems/cpukit/include/sys/poll.h