Version.scala

import Ordering.Implicits._

case class Version(name: String, numbers: (Int, Int, Int, Int)) extends AnyRef with Ordered[Version] {

  def compare(other: Version) = if (numbers == other.numbers) 0 else if (numbers < other.numbers) -1 else 1

}

VersionSpec.scala

import org.junit.runner.RunWith
import org.specs2.runner.JUnitRunner
import org.specs2.mutable.Specification

@RunWith(classOf[JUnitRunner])
class VersionSpec extends Specification {

  "1.0.0" should {
    "less than 1.0.1" in {
      Version("1.0.0", (1, 0, 0, 0)) < Version("1.0.1", (1, 0, 1, 0)) must beTrue
    }

    "greater than 0.9.8" in {
      Version("1.0.0", (1, 0, 0, 0)) > Version("0.9.8", (0, 9, 8, 0)) must beTrue
    }
  }

}

numbers compare other.numbers

以下のようになら書けるけど、ちょっと微妙・・・

case class Version(name: String, numbers: (Int, Int, Int, Int)) extends AnyRef with Ordered[Version] {

  def compare(other: Version) = Ordering[Tuple4[Int,Int,Int,Int]].compare(numbers, other.numbers)

}

Ordering.Ops にcompareがあれば、@j5ik2oさんが言ったように書けるのに、なんでないんでしょうね・・・

https://github.com/scala/scala/blob/v2.10.3/src/library/scala/math/Ordering.scala#L126-L134