What to set `SPARK_HOME` to?

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Installed apache-maven-3.3.3, scala 2.11.6, then ran:

$ git clone git://github.com/apache/spark.git -b branch-1.4
$ cd spark
$ build/mvn -DskipTests clean package

Finally:

$ git clone https://github.com/apache/incubator-zeppelin
$ cd incubator-zeppelin/
$ mvn install -DskipTests

Then ran the server:

$ bin/zeppelin-daemon.sh start

Running a simple notebook beginning with %pyspark, I got an error about py4j not being found. Just did pip install py4j (ref).

Now I'm getting this error:

pyspark is not responding Traceback (most recent call last):
  File "/tmp/zeppelin_pyspark.py", line 22, in <module>
    from pyspark.conf import SparkConf
ImportError: No module named pyspark.conf

I've tried setting my SPARK_HOME to: /spark/python:/spark/python/lib. No change.

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Two environment variables are required:

SPARK_HOME=/spark
PYTHONPATH=$SPARK_HOME/python:$SPARK_HOME/python/lib/py4j-VERSION-src.zip:$PYTHONPATH