How to change SBT's rules on generating URLs for Maven repositories?

By default, the Scala Built Tool (SBT) has a set of rules on how to generate URLs when looking up dependencies. For example, if I have the following build file,

// Project settings
name := "MyProject"

version := "0.1"

organization := "com.me"

scalaVersion := "2.8.1"

// Dependencies
libraryDependencies ++= Seq(
   "com.google.guava" %% "guava" % "r09"
)

// Repositories
resolvers += "Maven Central Server" at "http://repo1.maven.org/maven2"

Then SBT attempts to find guava at the following URL,

http://repo1.maven.org/maven2/com/google/guava/guava_2.8.1/r09/guava_2.8.1-r09.pom

However, the library I'm looking for in this case isn't even made for Scala, so combining the Scala version just 开发者_运维问答doesn't make sense here. How can I tell SBT what the format is for generating URLs for use with Maven repositories?

EDIT

While it seems that it is possible to edit the layout like so,

Resolver.url("Primary Maven Repository",
    new URL("http://repo1.maven.org/maven2/"))( Patterns("[organization]/[module]/[module]-[revision].[ext]") )

the "[module]" keyword is predefined to be the (artifact id)_(scala version) and the "[artifact]" keyword is just "ivy", leaving me back at square one.

As far as I remember "%%" appends the scala version and "%" does not. Try

libraryDependencies ++= Seq(
    "com.google.guava" % "guava" % "r09"
)

Check last one paragraph (Custom Layout) of official sbt wiki here.

Basically SBT allows you to use this syntax:

resolvers += Resolver.url("my-test-repo", url)( Patterns("[organisation]/[module]/[revision]/[artifact].[ext]") )