are inherently \fBnot\fR \fIsite\-specific\fR. \fBWARNING:\fR Use of
\fBrepos.conf\fR is generally not recommended since resulting changes in
eclass inheritance (especially due to \fBeclass\-overrides\fR) may trigger
-performance issues under some circumstances (see \fBbug #124041\fR).
+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
+make.conf in order to exclude the metadata/cache/ directory during
+\fBemerge\fR(1) \-\-sync operations.
.I Example:
.nf