diff --git a/default.nix b/default.nix
index 63e583e..f52eda4 100644
--- a/default.nix
+++ b/default.nix
@@ -1,5 +1,6 @@
 {pkgs,...}:
+with pkgs;
 {
-  xbuild = pkgs.callPackage ./pkgs/x/xbuild/package.nix {};
-  cedro = pkgs.callPackage ./pkgs/c/cedro/package.nix {};
+  xbuild = callPackage ./pkgs/x/xbuild/package.nix {};
+  cedro = callPackage ./pkgs/c/cedro/package.nix {};
 }
diff --git a/pkgs/x/xbuild/package.nix b/pkgs/x/xbuild/package.nix
index ee34b20..68dbede 100644
--- a/pkgs/x/xbuild/package.nix
+++ b/pkgs/x/xbuild/package.nix
@@ -3,9 +3,7 @@
   lib,
   stdenv,
   fetchFromGitHub,
-  autoconf,
-  automake,
-  libtool,
+  pkgs,
   ...
 }:
 
@@ -22,9 +20,9 @@ stdenv.mkDerivation {
   };
 
   nativeBuildInputs = [ 
-     autoconf 
-     automake 
-     libtool
+     pkgs.autoconf 
+     pkgs.automake 
+     pkgs.libtool
   ];
 
   preConfigure = ''