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https://issues.apache.org/jira/browse/ARROW-4873?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Wes McKinney updated ARROW-4873:
--------------------------------
    Description: 
I will improve the documentation about this "hybrid" use case, where I need to 
pass

{code}
-DARROW_DEPENDENCY_SOURCE=SYSTEM -DARROW_PACKAGE_PREFIX=$TOOLCHAIN
{code}

  was:
I use conda to manage Python dependencies but keep my C++ toolchain in a 
separate directory. This organizational scheme is incompatible with the new 
options after the CMake refactor

I think if you pass {{-DARROW_PREFIX_PATH=$MY_CPP_TOOLCHAIN}} then this should 
not be overridden with {{$CONDA_PREFIX}}


> [C++] Clarify documentation about how to use external ARROW_PACKAGE_PREFIX 
> while also using CONDA dependency resolution
> -----------------------------------------------------------------------------------------------------------------------
>
>                 Key: ARROW-4873
>                 URL: https://issues.apache.org/jira/browse/ARROW-4873
>             Project: Apache Arrow
>          Issue Type: Improvement
>          Components: C++
>            Reporter: Wes McKinney
>            Assignee: Uwe L. Korn
>            Priority: Major
>              Labels: pull-request-available
>             Fix For: 0.13.0
>
>          Time Spent: 2h 40m
>  Remaining Estimate: 0h
>
> I will improve the documentation about this "hybrid" use case, where I need 
> to pass
> {code}
> -DARROW_DEPENDENCY_SOURCE=SYSTEM -DARROW_PACKAGE_PREFIX=$TOOLCHAIN
> {code}



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