Building spark with native library support

[Alan Burlison]

Hi,

I've successfully built 0.9.0-incubating on Solaris using sbt, following 
the instructions at http://spark.incubator.apache.org/docs/latest/ and 
it seems to work OK. However, when I start it up I get an error about 
missing Hadoop native libraries. I can't find any mention of how to 
build the native components in the instructions, how is that done?

Thanks,

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Alan Burlison
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