[Tinyos-help] cannot upgrade tinyos 1.1.0

[jose m]

I need to upgrade tinyos 1.1.0 to 1.1.15. After update cygwin with the  version recommended by the community page, I follow the steps (rpm  ...blah blah) and an ugly message shows up:
  
  "failed dependences  >= 1.1.1 nesc required"
  
  eeeeh... my nesc is already >= 1.1.1, or isn't it?
  
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