--- rpmrc.in.dist	2016-01-11 18:43:16.000000000 +0900
+++ rpmrc.in	2016-01-11 18:45:53.000000000 +0900
@@ -340,6 +340,8 @@
 arch_compat: pentium3: i686
 arch_compat: i686: i586
 arch_compat: i586: i486
+# only with patched kernel!
+arch_compat: i586: i486 i686
 arch_compat: i486: i386
 arch_compat: i386: noarch fat