1 files changed, 6 insertions, 6 deletions
diff --git a/ext/socket/mkconstants.rb b/ext/socket/mkconstants.rb
index cfc0fbe069..1d4e90ba79 100644
--- a/ext/socket/mkconstants.rb
+++ b/ext/socket/mkconstants.rb
@@ -74,17 +74,15 @@ def each_name(pat)
   }
 end
 
+MISSING_DEFS = {}
+
 ERB.new(<<'EOS', nil, '%').def_method(Object, "gen_const_defs_in_guard(define, name, default_value)")
 % if default_value
-#ifndef <%=name%>
-#define <%=name%> <%=default_value%>
-#endif
-    <%=define%>(<%=c_str name%>, <%=name%>);
-% else
+%   MISSING_DEFS[name] = default_value
+% end
 #if defined(<%=name%>)
     <%=define%>(<%=c_str name%>, <%=name%>);
 #endif
-% end
 EOS
 
 ERB.new(<<'EOS', nil, '%').def_method(Object, "gen_const_defs")
@@ -273,6 +271,8 @@ init_constants(VALUE mConst)
 EOS
 
 header_result = ERB.new(<<'EOS', nil, '%').result(binding)
+<%= MISSING_DEFS.map {|name, value| ["\#ifndef #{name}", "\# define #{name} #{value}", '#endif']}.join("\n") %>
+
 <%= NAME_TO_INT_DEFS.map {|decl, func| decl }.join("\n") %>
 
 <%= INTERN_DEFS.map {|vardef, gen_hash, decl, func| decl }.join("\n") %>