jonkeane commented on code in PR #11666:
URL: https://github.com/apache/arrow/pull/11666#discussion_r854630061


##########
.env:
##########
@@ -82,6 +82,8 @@ TZ=UTC
 
 # -1 does not attempt to install a devtoolset version, any positive integer 
will install devtoolset-n
 DEVTOOLSET_VERSION=-1
+# set to true to enable ccache build configuration
+R_BUILD_CCACHE=false

Review Comment:
   One thing that will happen without it is for builds where it is not set, you 
get:
   
   ```
   WARNING: The R_CUSTOM_CCACHE variable is not set. Defaulting to a blank 
string.
   ```
   
   Which is fine, but is one consequence 



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