Index: head/sys/conf/kern.opts.mk
===================================================================
--- head/sys/conf/kern.opts.mk
+++ head/sys/conf/kern.opts.mk
@@ -48,6 +48,33 @@
     NAND \
     OFED
 
+# Some options are totally broken on some architectures. We disable
+# them. If you need to enable them on an experimental basis, you
+# must change this code.
+
+# Things that don't work based on the CPU
+.if ${MACHINE_CPUARCH} == "arm"
+BROKEN_OPTIONS+= CDDL ZFS
+.endif
+
+.if ${MACHINE_CPUARCH} == "mips"
+BROKEN_OPTIONS+= CDDL ZFS
+.endif
+
+.if ${MACHINE_CPUARCH} == "powerpc" && ${MACHINE_ARCH} == "powerpc"
+BROKEN_OPTIONS+= ZFS
+.endif
+
+# Things that don't work because the kernel doesn't have the support
+# for them.
+.if ${MACHINE} != "i386"
+BROKEN_OPTIONS+= EISA
+.endif
+
+.if ${MACHINE} != "i386" && ${MACHINE} != "amd64"
+BROKEN_OPTIONS+= OFED
+.endif
+
 # expanded inline from bsd.mkopt.mk to avoid share/mk dependency
 
 # Those that default to yes