Index: share/mk/bsd.mkopt.mk
===================================================================
--- share/mk/bsd.mkopt.mk
+++ share/mk/bsd.mkopt.mk
@@ -58,3 +58,12 @@
 .endif # !defined(MK_${var})
 .endfor
 .undef __DEFAULT_NO_OPTIONS
+
+#
+# MK_* options which are always no, usually because they are
+# unsupported/badly broken on this architecture.
+#
+.for var in ${__ALWAYS_NO_OPTIONS}
+MK_${var}:=	no
+.endfor
+.undef __ALWAYS_NO_OPTIONS
Index: sys/conf/kern.opts.mk
===================================================================
--- sys/conf/kern.opts.mk
+++ sys/conf/kern.opts.mk
@@ -83,6 +83,16 @@
 .undef __DEFAULT_NO_OPTIONS
 
 #
+# MK_* options which are always no, usually because they are
+# unsupported/badly broken on this architecture.
+#
+.for var in ${__ALWAYS_NO_OPTIONS}
+MK_${var}:=	no
+.endfor
+.undef __ALWAYS_NO_OPTIONS
+#end of bsd.mkopt.mk expanded inline.
+
+#
 # MK_*_SUPPORT options which default to "yes" unless their corresponding
 # MK_* variable is set to "no".
 #
@@ -104,6 +114,3 @@
 .endif
 .endif
 .endfor
-
-
-