nealrichardson commented on a change in pull request #9898:
URL: https://github.com/apache/arrow/pull/9898#discussion_r613713875



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File path: r/vignettes/install.Rmd
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@@ -335,6 +286,16 @@ See discussion 
[here](https://issues.apache.org/jira/browse/ARROW-8556).
 
 ## Summary of build environment variables
 
+Some features are optional when you build Arrow from source
+
+* `ARROW_S3`: If set to `true` S3 support will be built (as long as the 
+  dependencies are met, if they are not met, this may be automatically turned 
off) (default: false)
+* `ARROW_JEMALLOC`: If set to `true` jemalloc support will be included 
(default: true)
+* `ARROW_PARQUET`: If set to `true` parquet support will be included (default: 
true)
+* `ARROW_DATASET`: If set to `true` dataset support will be included (default: 
true)
+* `ARROW_WITH_RE2`: If set to `true` RE2 regular expression library support 
will be included (default: true)
+* `ARROW_WITH_UTF8PROC`: If set to `true` UTF8Proc string library support will 
be included (default: true)
+
 By default, these are all unset. All boolean variables are case-insensitive.

Review comment:
       ```suggestion
   There are a number of other variables that affect the `configure` script and 
the bundled build script.
   By default, these are all unset. All boolean variables are case-insensitive.
   ```




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