Tried to use apt-cache search scala and found ubuntu could easily install scala. But it doesn’t work on MAC. Use port search scala knew that scala in port has different version. Must use something like port install scala-2.9 If you need to compiler the scala code, you must use scalar-2.9 which is not convenient. Two way to change it. First is soft link the binary scala & scalac to scala-2.9 & scalac-2.9 which is not good...

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