Print out the script in use.

mkClojureLib.nix

@@ -27,7 +27,8 @@ in stdenv.mkDerivation {
   nativeBuildInputs = [ clojure jre ];
   buildInputs = (map (x: x.paths) clj-deps.packages);
 
-  buildPhase = ''
+  buildPhase = let
+    script = writeShellScript "create-uberjar.sh" ''
       HOME=$TEMP/home
       mkdir -p $HOME
       mkdir -p ${target}
@@ -42,6 +43,7 @@ in stdenv.mkDerivation {
         :srcs    ${concatStringsSep "," src-paths} \
         :target  ${target}
     '';
+  in "${builtins.trace script script}";
 
   installPhase = ''
     mv ${target}/${name}-${version}-standalone.jar $out