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diff --git a/config.h b/config.h
index d73b5b5..86bd6e0 100644
--- a/config.h
+++ b/config.h
@@ -5,6 +5,16 @@
 **/
 
 
+/*
+ * By default, only ARMv4 instructions are used.
+ * If you want Cyclone to make use of newer ARM instructions, enable the
+ * options(s) below. You can also override this using make argument:
+ *   make HAVE_ARMv6=1
+ */
+#ifndef HAVE_ARMv6
+#define HAVE_ARMv6                  0
+#endif
+
 /*
  * If this option is enabled, Microsoft ARMASM compatible output is generated
  * (output file -  Cyclone.asm). Otherwise GNU as syntax is used (Cyclone.s).