--- Makefile.orig	2011-12-11 20:54:02.000000000 +0100
+++ Makefile	2012-01-09 17:36:55.059392824 +0100
@@ -17,7 +17,7 @@
 
 install:
 	for dir in $(SUBDIRS); do \
-	  mkdir $(DESTDIR)/$(CERTSDIR)/$$dir; \
+	  mkdir -p $(DESTDIR)/$(CERTSDIR)/$$dir; \
 	  $(MAKE) -C $$dir install CERTSDIR=$(DESTDIR)/$(CERTSDIR)/$$dir; \
 	done
 	for dir in sbin; do \
