--- a/arch/x86/Makefile
+++ b/arch/x86/Makefile
@@ -125,6 +125,9 @@ libs-y  += arch/x86/lib/
 # See arch/x86/Kbuild for content of core part of the kernel
 core-y += arch/x86/
 
+# RDC R-321X support
+core-$(CONFIG_X86_RDC321X)   += arch/x86/mach-rdc321x/
+
 # drivers-y are linked after core-y
 drivers-$(CONFIG_MATH_EMULATION) += arch/x86/math-emu/
 drivers-$(CONFIG_PCI)            += arch/x86/pci/