Index: ruby-1.9.3-p194/lib/mkmf.rb
===================================================================
--- ruby-1.9.3-p194.orig/lib/mkmf.rb
+++ ruby-1.9.3-p194/lib/mkmf.rb
@@ -1998,11 +1998,10 @@ static: $(STATIC_LIB)#{$extout ? " insta
   dirs = []
   mfile.print "install: install-so install-rb\n\n"
   sodir = (dir = "$(RUBYARCHDIR)").dup
-  mfile.print("install-so: ")
   if target
     f = "$(DLLIB)"
     dest = "#{dir}/#{f}"
-    mfile.puts dir, "install-so: #{dest}"
+    mfile.puts "install-so: #{dest}"
     if $extout
       mfile.print "clean-so::\n"
       mfile.print "\t@-$(RM) #{fseprepl[dest]}\n"
@@ -2015,7 +2014,7 @@ static: $(STATIC_LIB)#{$extout ? " insta
       end
     end
   else
-    mfile.puts "Makefile"
+    mfile.puts "install-so: Makefile"
   end
   mfile.print("install-rb: pre-install-rb install-rb-default\n")
   mfile.print("install-rb-default: pre-install-rb-default\n")
@@ -2024,14 +2023,11 @@ static: $(STATIC_LIB)#{$extout ? " insta
   for sfx, i in [["-default", [["lib/**/*.rb", "$(RUBYLIBDIR)", "lib"]]], ["", $INSTALLFILES]]
     files = install_files(mfile, i, nil, srcprefix) or next
     for dir, *files in files
-      unless dirs.include?(dir)
-        dirs << dir
-        mfile.print "pre-install-rb#{sfx}: #{dir}\n"
-      end
       for f in files
         dest = "#{dir}/#{File.basename(f)}"
-        mfile.print("install-rb#{sfx}: #{dest} #{dir}\n")
+        mfile.print("install-rb#{sfx}: #{dest}\n")
         mfile.print("#{dest}: #{f}\n")
+        mfile.print("\t$(Q) $(MAKEDIRS) $(@D#{sep})\n")
         mfile.print("\t$(Q) $(#{$extout ? 'COPY' : 'INSTALL_DATA'}) #{f} $(@D#{sep})\n")
         if defined?($installed_list) and !$extout
           mfile.print("\t@echo #{dest}>>$(INSTALLED_LIST)\n")
@@ -2054,8 +2050,6 @@ static: $(STATIC_LIB)#{$extout ? " insta
       end
     end
   end
-  dirs.unshift(sodir) if target and !dirs.include?(sodir)
-  dirs.each {|d| mfile.print "#{d}:\n\t$(Q) $(MAKEDIRS) $@\n"}
 
   mfile.print <<-SITEINSTALL