AFAICS there are no particular EAPI 6 features this eclass could make
use of, so we can simply add 6 to the case pattern.

Ulrich


--- a/eclass/readme.gentoo.eclass
+++ b/eclass/readme.gentoo.eclass
@@ -1,4 +1,4 @@
-# Copyright 1999-2014 Gentoo Foundation
+# Copyright 1999-2015 Gentoo Foundation
 # Distributed under the terms of the GNU General Public License v2
 # $Id$
 
@@ -24,7 +24,7 @@ case "${EAPI:-0}" in
 	0|1|2|3)
 		die "Unsupported EAPI=${EAPI:-0} (too old) for ${ECLASS}"
 		;;
-	4|5)
+	4|5|6)
 		# EAPI>=4 is required for REPLACING_VERSIONS preventing us
 		# from needing to export another pkg_preinst phase to save has_version
 		# result. Also relies on EAPI >=4 default src_install phase.