Index: share/mk/bsd.own.mk
===================================================================
--- share/mk/bsd.own.mk	(revision 248395)
+++ share/mk/bsd.own.mk	(working copy)
@@ -402,7 +402,8 @@
 __DEFAULT_NO_OPTIONS+=CLANG CLANG_FULL
 .endif
 # Clang the default system compiler only on x86.
-.if ${__T} == "amd64" || ${__T} == "i386"
+.if ${__T} == "amd64" || ${__T} == "arm" || ${__T} == "armv6" || \
+    ${__T} == "i386"
 __DEFAULT_YES_OPTIONS+=CLANG_IS_CC
 .else
 __DEFAULT_NO_OPTIONS+=CLANG_IS_CC