update config

config/layout.conf

@@ -22,6 +22,9 @@ PACKAGESDIR="${STOREDIR}/packages"
 # synchronization with the mainline (usually Gentoo).
 PORTAGESDIR="${STOREDIR}/portages"
 
+# This is the directory that contains a compressed tarball with produced Portage snapshot.
+SNAPSHOTSDIR="${STORAGEDIR}/snapshots"
+
 # This specifies the directory where EzBuild will put its temporary files and caches.
 TEMPDIR="${STOREDIR}/temp"