Fix directory creation during install phase

--- ./Makefile.in	2003-11-13 10:38:19 +0300
+++ ./Makefile.in	2006-06-15 00:53:21 +0400
@@ -19,12 +19,12 @@
 install:: install.bin install.man
 
 install.bin:
-	test -d "$(DESTDIR)$(BINDIR)" || mkdir "$(DESTDIR)$(BINDIR)"
+	test -d "$(DESTDIR)$(BINDIR)" || mkdir -p -- "$(DESTDIR)$(BINDIR)"
 	@INSTALL_PROGRAM@ x2vnc "$(DESTDIR)$(BINDIR)/x2vnc"
 
 install.man:
-	test -d "$(DESTDIR)$(MANDIR)" || mkdir "$(DESTDIR)$(MANDIR)"
-	test -d "$(DESTDIR)$(MANDIR)/man1" || mkdir "$(DESTDIR)$(MANDIR)/man1"
+	test -d "$(DESTDIR)$(MANDIR)" || mkdir -p -- "$(DESTDIR)$(MANDIR)"
+	test -d "$(DESTDIR)$(MANDIR)/man1" || mkdir -p -- "$(DESTDIR)$(MANDIR)/man1"
 	@INSTALL_DATA@ x2vnc.man "$(DESTDIR)$(MANDIR)/man1/x2vnc.1"
 
 clean: