/home/travis/build/msgpack/msgpack-java/build.sbt:59: warning: `<<=` operator is deprecated. Use `key := { x.value }` or `key ~= (old => { newValue })`.
See http://www.scala-sbt.org/0.13/docs/Migrating-from-sbt-012x.html
  compile <<= (compile in Compile) dependsOn (jcheckStyle in Compile),
          ^
/home/travis/build/msgpack/msgpack-java/build.sbt:60: warning: `<<=` operator is deprecated. Use `key := { x.value }` or `key ~= (old => { newValue })`.
See http://www.scala-sbt.org/0.13/docs/Migrating-from-sbt-012x.html
  compile <<= (compile in Test) dependsOn (jcheckStyle in Test)
          ^