Index: ruby-1.9.1-p243/lib/mkmf.rb
===================================================================
--- ruby-1.9.1-p243.orig/lib/mkmf.rb
+++ ruby-1.9.1-p243/lib/mkmf.rb
@@ -1681,6 +1681,7 @@ static: $(STATIC_LIB)#{$extout ? " insta
       mfile.print "\t@-$(RMDIRS) #{fseprepl[dir]}\n"
     else
       mfile.print "#{dest}: #{f}\n"
+      mfile.print "\t@$(MAKEDIRS) #{dir}"
       mfile.print "\t$(INSTALL_PROG) #{fseprepl[f]} #{fseprepl[dir]}\n"
       if defined?($installed_list)
 	mfile.print "\t@echo #{dir}/#{File.basename(f)}>>$(INSTALLED_LIST)\n"
@@ -1704,6 +1705,7 @@ static: $(STATIC_LIB)#{$extout ? " insta
 	dest = "#{dir}/#{File.basename(f)}"
 	mfile.print("install-rb#{sfx}: #{dest}\n")
         mfile.print("#{dest}: #{f}\n")
+        mfile.print "\t@$(MAKEDIRS) #{dir}"
         mfile.print("\t$(#{$extout ? 'COPY' : 'INSTALL_DATA'}) ")
 	mfile.print("#{fseprepl[f]} $(@D#{sep})\n")
 	if defined?($installed_list) and !$extout