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将scala(或字节码)转换为本机二进制文件以提高性能的最佳方法是什么

当我使用sbt构建Scala本机演示时,rtlib/publishLocal nscplugin/publishLocal它会出现以下错误

java version "1.8.0_31"
Java(TM) SE Runtime Environment (build 1.8.0_31-b13)
Java HotSpot(TM) 64-Bit Server VM (build 25.31-b07, mixed mode)

Scala代码运行版本 2.12.0-M3 -- Copyright 2002-2015, LAMP/EPFL

错误

[info] Loading project definition from D:\Work\RandD\WSAMITScript\Scala-Native\scala-native\project
java.io.IOException: Cannot run program "which": CreateProcess error=2, The system cannot find the file specified
    at java.lang.ProcessBuilder.start(Unknown Source)
    at sbt.SimpleProcessBuilder.run(ProcessImpl.scala:349)
    at sbt.AbstractProcessBuilder.lines(ProcessImpl.scala:149)
    at sbt.AbstractProcessBuilder.lines_$bang(ProcessImpl.scala:143)
    at scala.scalanative.sbtplugin.ScalaNative