usa	2017-12-11 11:30:21 +0900 (Mon, 11 Dec 2017)

  New Revision: 61107

  https://svn.ruby-lang.org/cgi-bin/viewvc.cgi?view=revision&revision=61107

  Log:
    depend on win32.h on Windows
    
    * lib/mkmf.rb (depend_rules): all objs should depend on win32.h on Windows.

  Modified files:
    trunk/lib/mkmf.rb
Index: lib/mkmf.rb
===================================================================
--- lib/mkmf.rb	(revision 61106)
+++ lib/mkmf.rb	(revision 61107)
@@ -2124,7 +2124,10 @@ RULES https://github.com/ruby/ruby/blob/trunk/lib/mkmf.rb#L2124
     unless suffixes.empty?
       depout.unshift(".SUFFIXES: ." + suffixes.uniq.join(" .") + "\n\n")
     end
-    depout.unshift("$(OBJS): $(RUBY_EXTCONF_H)\n\n") if $extconf_h
+    if $extconf_h
+      depout.unshift("$(OBJS): $(RUBY_EXTCONF_H)\n\n")
+      depout.unshift("$(OBJS): $(hdrdir)/ruby/win32.h\n\n") if $mswin or $mingw
+    end
     depout.flatten!
     depout
   end

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