On my F-8 machine:
$ echo /bin/ls | /usr/lib/rpm/find-requires libacl.so.1()(64bit) libc.so.6()(64bit) libc.so.6(GLIBC_2.2.5)(64bit) libc.so.6(GLIBC_2.3.4)(64bit) libc.so.6(GLIBC_2.3)(64bit) libc.so.6(GLIBC_2.4)(64bit) librt.so.1()(64bit) librt.so.1(GLIBC_2.2.5)(64bit) libselinux.so.1()(64bit)
However on my Rawhide machine, updated to the latest version, the same command prints nothing at all!
As a result rpmbuild is generating empty lists of requires for anything I build.
$ rpm -qf /usr/lib/rpm/find-requires rpm-build-4.4.2.3-1.fc9.i386
Rich.