Github user shivaram commented on the pull request:
https://github.com/apache/spark/pull/5096#issuecomment-90362775
@pwendell I tried to reproduce the build with R not installed on the
machine with a clean Ubuntu VM, but I actually got a failure with a relevant
error message
```
[ERROR] Failed to execute goal
org.codehaus.mojo:exec-maven-plugin:1.3.2:exec (sparkr-pkg) on project
spark-core_2.10: Command execution failed. Process exited with an error: 127
(Exit value: 127) -> [Help 1]
```
And before the Maven summary I also see
```
../R/install-dev.sh: line 36: R: command not found
```
On a related note I also changed `run-tests` to not run SparkR tests if R
is not installed.
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