Index: share/mk/bsd.obj.mk
===================================================================
--- share/mk/bsd.obj.mk
+++ share/mk/bsd.obj.mk
@@ -81,14 +81,16 @@
 .if !defined(NO_OBJ)
 .if !target(obj)
 obj: .PHONY
-	@if ! test -d ${CANONICALOBJDIR}/; then \
-		mkdir -p ${CANONICALOBJDIR}; \
-		if ! test -d ${CANONICALOBJDIR}/; then \
-			${ECHO} "Unable to create ${CANONICALOBJDIR}."; \
+.for dir in ${CANONICALOBJDIR} ${EXTRA_OBJDIRS:S/^/${CANONICALOBJDIR}\/&/}
+	@if ! test -d ${dir}/; then \
+		mkdir -p ${dir}; \
+		if ! test -d ${dir}/; then \
+			${ECHO} "Unable to create ${dir}."; \
 			exit 1; \
 		fi; \
-		${ECHO} "${CANONICALOBJDIR} created for ${.CURDIR}"; \
+		${ECHO} "${CANONICALOBJDIR}${dir} created for ${.CURDIR}${dir}"; \
 	fi
+.endfor
 .endif
 
 .if !target(objlink)