Установите Scala с помощью Brew
$ brew update
$ brew install scala
$ brew install sbt
Handsome Hummingbird
$ brew update
$ brew install scala
$ brew install sbt
$ echo '-J-XX:+CMSClassUnloadingEnabled' >> /usr/local/etc/sbtopts
$ echo '-J-Xmx2G' >> /usr/local/etc/sbtopts