extract once and build many?

[Denise H. G.]

Hi all

   I noticed that some ports, e.g. qt-4 stuff, just use the same source
   ball but extract it each time for their own build. Is there some
   method to reuse the extracted sources? I think it is perhaps a waste
   of cpu and time to extract the same source ball for different build
   tasks.
 
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darcsis ZAI gmail DIAN com