--- a/net-fs/autofs/autofs-5.1.3.ebuild	
+++ a/net-fs/autofs/autofs-5.1.3.ebuild	
@@ -38,8 +38,12 @@ RDEPEND=">=sys-apps/util-linux-2.20
 			virtual/krb5
 		)
 	)
+	|| (
+		libtirpc? ( <sys-libs/glibc-2.26 )
+		!libtirpc? ( sys-libs/glibc[rpc(-)] )
+		( >=sys-libs/glibc-2.26 net-libs/rpcsvc-proto )
+	)
 	libtirpc? ( net-libs/libtirpc )
-	!libtirpc? ( sys-libs/glibc[rpc(-)] )
 "
 DEPEND="${RDEPEND}
 	sys-devel/flex