Index: sys-apps/man/man-1.6e-r3.ebuild
===================================================================
--- sys-apps/man/man-1.6e-r3.ebuild	(revision 5449)
+++ sys-apps/man/man-1.6e-r3.ebuild	(working copy)
@@ -139,10 +139,11 @@
 
 pkg_postinst() {
 	einfo "Forcing sane permissions onto ${EROOT}/var/cache/man (Bug #40322)"
-	chown -R root:man "${EROOT}"/var/cache/man
+	use prefix ||
+	chown -R ${PORTAGE_INST_UID}:man "${EROOT}"/var/cache/man
 	chmod -R g+w "${EROOT}"/var/cache/man
 	[[ -e ${EROOT}/var/cache/man/whatis ]] \
-		&& chown root:0 "${EROOT}"/var/cache/man/whatis
+		&& chown ${PORTAGE_INST_UID}:${PORTAGE_INST_GID} "${EROOT}"/var/cache/man/whatis
 
 	echo