You can still use the pre 2.2.x way to configure your project with the project/Build.scala
file (2.2.x Release Notes - sbt 0.13 support), but I think that is only possible if you remove the new build.sbt
file.
On the play mailing list was discussed another solution which works with the build.sbt
file (Setting lessEntryPoints in build.sbt).
play.Keys.lessEntryPoints <<= baseDirectory { base =>
(base / "app" / "assets" / "stylesheets" / "bootstrap" * "bootstrap.less") +++
(base / "app" / "assets" / "stylesheets" / "bootstrap" * "responsive.less") +++
(base / "app" / "assets" / "stylesheets" * "*.less")
}
I tested it in a little sample project and it works (Sample project with play 2.2.1 and Bootstrap 3.1.0 on github).