Just skip ruby

mkClojureLib.nix

@@ -1,4 +1,4 @@
-{ lib, stdenv, callPackage, jre, ruby, clojure, build-tools-jar, writeScript
+{ lib, stdenv, callPackage, jre, clojure, build-tools-jar, writeScript
 , writeText }:
 { src, name, group, version, clj-deps, src-paths }:
 
@@ -42,14 +42,16 @@ in stdenv.mkDerivation {
     HOME=$TEMP/home
     mkdir -p $HOME
     mkdir -p ${target}
-    ${uberjar-script}
-      --root=$PWD \
-      --classpath=${classpath} \
-      --target=${target} \
-      --project=${group}/${name} \
-      --version=${version} \
-      --build-deps=${built-tools-deps} \
-      --source-paths=${concatStringsSep "," src-paths}
+
+    clojure \
+      -Scp ${classpath} \
+      -Sdeps   ${build-tools-deps} \
+      -T:build \
+      lib-uberjar \
+      :project ${group}/${name} \
+      :version ${version}" \
+      :srcs    ${concatStringsSep "," src-paths}"
+      :target  ${target}
   '';
 
   installPhase = ''