If /etc/ld.so.conf.d/ is empty, lddtree spits /usr/bin/lddtree: line 68: ld.so.conf.d/*.conf: No such file or directory upon every lib it reads during printing the output. IIRC, it's a regression, as this wasn't so noisy before.
http://sources.gentoo.org/gentoo-projects/pax-utils/lddtree.sh?r1=1.10&r2=1.11