diff --git a/builder.nix b/builder.nix
index 04abea2..5faf22d 100644
--- a/builder.nix
+++ b/builder.nix
@@ -20,13 +20,13 @@ let
       __builder = if isFunction _builder then _builder funcPkgs
                   else _builder;
       args = { stdenv = pkgs.stdenvNoCC; } // (if isString __builder
-             then { builder = __builder; }
-             else  __builder);
+                                               then { builder = __builder; }
+                                               else  __builder);
     in (args.deriver or args.stdenv.mkDerivation) ({
       name = pkgs.lib.strings.sanitizeDerivationName (builtins.elemAt rargs 0);
       buildCommand = args.builder;
       passAsFile = [ "buildCommand" ];
       preferLocalBuild = true;
       allowSubstitutes = false;
-    } // (removeAttrs args [ "builder" "system" "deriver" ])); # myself
+    } // (removeAttrs args [ "builder" "system" "deriver" "stdenv" ])); # myself
 in myself builderArgs
diff --git a/default.nix b/default.nix
index fe31171..7dd53fe 100644
--- a/default.nix
+++ b/default.nix
@@ -8,8 +8,11 @@ stdenv.mkDerivation {
 
   installPhase = ''
     mkdir -p $out/bin
-    cp ${./nixredo} $out/bin/nixredo
-    substituteAllInPlace $out/bin/nixredo
-    chmod +x $out/bin/nixredo
+    for f in ${./nixredo} ${./nixredo-deps}; do
+      _f=$out/bin/nixredo''${f##*-nixredo}
+      cp $f $_f
+      substituteAllInPlace $_f
+      chmod +x $_f
+    done
   '';
 }
diff --git a/nixredo b/nixredo
index 59844e3..6581723 100644
--- a/nixredo
+++ b/nixredo
@@ -1,17 +1,22 @@
 #!/bin/sh
 exec >&2
-[ -n "$NIXREDO_ROOT" ] || { printf "Set NIXREDO_ROOT. Set empty to use global nix store\n"; exit 127; }
+[ "${NIXREDO_ROOT-x}" != x ] || { printf "Set NIXREDO_ROOT. Set empty to use global nix store\n"; exit 127; }
 if [ $# -eq 0 ]; then set -- all; fi
 if [ -e "$1.nix" ]; then
   set -e
   set -- "$1" "$1" "$1.redo.tmp"
   f=$(realpath "$1.nix")
-  out=$(nix -vL build ${NIXREDO_ROOT:+--store "$NIXREDO_ROOT"} --option auto-optimise-store true --impure --json --no-link --expr "import @buildernix@ { cwd = \"$PWD/\"; rargs = [ \"$1\" \"$1\" ];} \"$f\"" | @jq@ -r '.[0].outputs.out')
+  out=$(nix -vL --show-trace build ${NIXREDO_ROOT:+--store "$NIXREDO_ROOT"} \
+            --option auto-optimise-store true --option substituters daemon \
+            --impure --json --no-link \
+            --expr "import @buildernix@ { cwd = \"$PWD/\"; rargs = [ \"$1\" \"$1\" ];} \"$f\"" |
+            @jq@ -r '.[0].outputs.out')
   [ -n "$out" ] || exit 127
-  rm -rf "$1"
-  ln "${NIXREDO_ROOT+$NIXREDO_ROOT/}$out" "$3"
-  chmod +w "$3"
-  touch "$3"
+  rm -rf "$3"
+  ln -s "${NIXREDO_ROOT+$NIXREDO_ROOT}$out" "$3"
+  # ln "${NIXREDO_ROOT+$NIXREDO_ROOT/}$out" "$3"
+  # chmod +w "$3"
+  # touch "$3"
   mv "$3" "$1"
 elif [ -e "$1" ]; then
   :
diff --git a/nixredo-deps b/nixredo-deps
new file mode 100644
index 0000000..622bc45
--- /dev/null
+++ b/nixredo-deps
@@ -0,0 +1,7 @@
+#!/bin/sh
+exec >&2
+[ "${NIXREDO_ROOT-x}" != x ] || { printf "Set NIXREDO_ROOT. Set empty to use global nix store\n"; exit 127; }
+
+f=$(realpath "$1")
+drv=$(nix-store --store "$NIXREDO_ROOT" -qd "${f#$NIXREDO_ROOT}/nix/store")
+nix-store --store "$NIXREDO_ROOT" -qR "${drv#$NIXREDO_ROOT}"