Debug the command

mkClojureLib.nix

@@ -32,7 +32,8 @@ in stdenv.mkDerivation {
   nativeBuildInputs = [ clojure ];
   buildInputs = (map (x: x.paths) clj-deps.packages);
 
-  buildPhase = ''
+  buildPhase = let
+    cmd = ''
       HOME=$TEMP/home
       mkdir -p $HOME
       mkdir -p ${target}
@@ -47,6 +48,7 @@ in stdenv.mkDerivation {
         :srcs    ${concatStringsSep "," src-paths}" \
         :target  ${target}
     '';
+  in builtins.trace cmd cmd;
 
   installPhase = ''
     mv ${target}/${name}-${version}-standalone.jar $out