eclass inheritance (especially due to \fBeclass\-overrides\fR) may trigger
performance issues under some circumstances (see \fBbug #124041\fR). When
using \fBeclass\-overrides\fR, due to bug #276264, you must ensure that
-your portage tree does not contain a metadata/cache/. For example, you
-should set PORTAGE_RSYNC_EXTRA_OPTS="\-\-exclude=/metadata/cache" in
+your portage tree does not contain a metadata/cache/ directory. If that
+directory exists then you should remove it entirely, and set
+PORTAGE_RSYNC_EXTRA_OPTS="\-\-exclude=/metadata/cache" in
make.conf in order to exclude the metadata/cache/ directory during
\fBemerge\fR(1) \-\-sync operations.