kou commented on code in PR #11666:
URL: https://github.com/apache/arrow/pull/11666#discussion_r857268874


##########
.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:
   @jonkeane Please add `R_CUSTOM_CCACHE` to `.env` to suppress the warning. We 
should add the default value to `.env` when we add a new variable that is used 
in `docker-compose.yml`.



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