RPMbuild behaviour on Red Hat Enterprise Linux 6

Issue

• I'm trying to use a simple spec file that I used in RHEL5 which only grabs some files and packages them into an RPM.
• When I try to build on RHEL6 it forces me to create all the whole build tree structure.
• The spec file I'm using has a %files section with the files I want, but no %prep, %build, %install or any other section besides package description. BuildRoot is set to /tmp.
• I get this:

    RPM build errors:
        File not found by glob: /root/rpmbuild/BUILDROOT/package/files/full/path/*
        File not found: /root/rpmbuild/BUILDROOT/...