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How to specify existing software when building from source?

I'm building sage-7.6 on a CentOS6 machine as per the instructions found on the docs pages, about compiling from source, and it succeeds, but the resulting distribution is 8G in size which is a little unwieldy for deploying to multiple machines.

I notice that it's compiling its own versions of a bunch of things we already have installed, though maybe not at quite exactly the same version number.

Is there a way to use the already installed versions of gcc, python, etc, rather than have sage build its own versions?