Jonathan Keane created ARROW-12049:
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             Summary: [R] [Documentation] Documentation for making an offline 
build
                 Key: ARROW-12049
                 URL: https://issues.apache.org/jira/browse/ARROW-12049
             Project: Apache Arrow
          Issue Type: Improvement
          Components: Documentation, R
            Reporter: Jonathan Keane


For the most part, when Arrow builds locally it attempts to download the 
dependency binaries/sources that are necessary to build successfully. It is 
possible, however, to build Arrow in an offline mode where you manually 
download the sources/binaries and point the build process to them (use case: 
you're on a corporate network which blocks downloads from github). We should 
document that this process exists and walk people through how to use it. There 
might already be documentation for this in the CPP docs, so maybe we just need 
a brief description + a link, or we might do that + make the cpp docs slightly 
better while we're at it.

Recent example of this happening (with the added fun of centos 7) is ARROW-12026



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