diff --git a/build.tools.nix b/build.tools.nix
index 34a5c41..770d29d 100644
--- a/build.tools.nix
+++ b/build.tools.nix
@@ -17,8 +17,10 @@ let
 
   pthru = o: builtins.trace o o;
 
-  java-compile = classpath: ns:
-    ''java -cp .:${classpath} clojure.main -e "(compile ${ns})"'';
+  java-compile = classpath: ns: ''
+    echo "building namespace: ${ns}"...
+    java -cp .:${classpath} clojure.main -e "(compile ${ns})"
+  '';
   head-or-null = lst: if (lst == [ ]) then null else head lst;
   matches-ext = ext: filename: (builtins.match ".+[.]${ext}$" filename) != null;
   strip-ext = ext: filename:
@@ -68,7 +70,8 @@ in stdenv.mkDerivation {
       cp ${./src}/build.clj .
       ${concatStringsSep "\n" (map extract-jar dep-jars)}
       ${concatStringsSep "\n"
-      (map (java-compile tools-classpath) (tools-namespaces ++ [ "'build" ]))}
+      (map (java-compile tools-classpath) tools-namespaces)}
+      ${java-compile "" "'build"}
       jar cmf ${manifest} ./out.jar -C . ${
         concatStringsSep " " [
           "build"
@@ -88,7 +91,7 @@ in stdenv.mkDerivation {
       }
       cat /tmp/*.edn
     '';
-  in "${build-script}";
+  in pthru "${build-script}";
 
   installPhase = ''
     cp out.jar $out
diff --git a/flake.nix b/flake.nix
index afc3fbd..ec9c717 100644
--- a/flake.nix
+++ b/flake.nix
@@ -6,7 +6,7 @@
     utils.url = "github:numtide/flake-utils";
     clj2nix.url = "github:hlolli/clj2nix";
     build-tools-src = {
-      url = "github:clojure/tools.build?tag=v0.8.2";
+      url = "github:clojure/tools.build?tag=v0.6.8";
       flake = false;
     };
     gitignore = {
@@ -22,7 +22,7 @@
       system = "x86_64-linux";
       pkgs = nixpkgs.legacyPackages."${system}";
       build-tools-jar = pkgs.callPackage ./build.tools.nix {
-        version = "0.8.2";
+        version = "0.6.8";
         inherit build-tools-src;
         inherit (gitignore.lib) gitignoreSource;
       };