Maybe java doesn't like the long path?

mkClojureLib.nix

@@ -34,12 +34,15 @@ in stdenv.mkDerivation {
   buildPhase = let
     cmd = ''
       HOME=$TEMP/home
+      BHOME=$TEMP/build-home
       mkdir -p $HOME
       mkdir -p ${target}
+      mkdir -p $BHOME
+      cp ${build-tools-deps} $BHOME/deps.edn
 
       clojure \
         -Scp     .:${build-tools-jar}:${classpath} \
-        -Sdeps   ${build-tools-deps}/deps.edn \
+        -Sdeps   $BHOME/deps.edn \
         -X:build \
         lib-uberjar \
         :project ${group}/${name} \