[Mingw-cross-env-list] Anyway to remove installed packages ?

[Huang KangJing]

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Hi there.

   I don't know if here are some people can help me... But it seems
that this is the only place that has been holding discussion about MXE.
   I've been using your project for building win32 executables for
quite a while, and it really works great...The problem is that I once
installed qt 4 libraries in my MXE environment and now I'm switching
to qt 5 libraries, but I do not have much disk space left... So I
decided to remove my qt 4 libraries and some other libraries that I
don't need anymore... Yet I didn't figure out a way to do so through
out all the documents avaliable... That's why I'm here to ask.
   I would be very glad to any kind of response.
- -- 
Sincerely,
Huang KangJing
2012 Undergraduate, School of Physics,Peking University

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