(defproject useful "0.7.6"
  :description "A collection of generally-useful Clojure utility functions"
  :dependencies [[clojure "1.3.0"]
                 [org.clojure/tools.macro "0.1.1"]])

(defproject useful "0.7.6"
  :description "A collection of generally-useful Clojure utility functions"
  :dependencies [[clojure "1.4.0-beta1"]
                 [org.clojure/tools.macro "0.1.1"]]
  :multi-deps {"1.3" [[clojure "1.3.0"]]
               "1.2" [[clojure "1.2.1"]]
               :all [[org.clojure/tools.macro "0.1.1"]]})

Use lein-multi, and test 1.4 beta
Use lein-multi, and test 1.4 beta

amalloy/useful,jafingerhut/useful,flatland/useful