diff --git a/default.nix b/default.nix
index f52eda4..f4d2504 100644
--- a/default.nix
+++ b/default.nix
@@ -1,6 +1,7 @@
-{pkgs,...}:
+{pkgs,mypkgs,...}:
 with pkgs;
 {
   xbuild = callPackage ./pkgs/x/xbuild/package.nix {};
   cedro = callPackage ./pkgs/c/cedro/package.nix {};
+  capnpc = callPackage ./pkgs/c/capnpc/package.nix {};
 }
diff --git a/flake.nix b/flake.nix
index b680291..8e813dd 100644
--- a/flake.nix
+++ b/flake.nix
@@ -3,9 +3,10 @@
 
   inputs = {
     nixpkgs.url = "github:nixos/nixpkgs?ref=nixos-unstable";
+    mypkgs.url  = "github:shen390s/my-nix-channel?ref=master";
   };
 
-  outputs = { self, nixpkgs}:
+  outputs = { self, nixpkgs, mypkgs}:
     let
       supportedSystems = [ "x86_64-linux" ];
       forAllSystems = nixpkgs.lib.genAttrs supportedSystems;
@@ -14,7 +15,7 @@
       packages = forAllSystems (system: let
         pkgs = nixpkgs.legacyPackages.${system};
       in
-        import ./default.nix { inherit pkgs; });
+        import ./default.nix { inherit pkgs; inherit mypkgs;});
     };
 }
 
diff --git a/pkgs/c/capnpc/package.nix b/pkgs/c/capnpc/package.nix
new file mode 100644
index 0000000..11e8158
--- /dev/null
+++ b/pkgs/c/capnpc/package.nix
@@ -0,0 +1,46 @@
+{
+  lib,
+  stdenv,
+  fetchFromGitHub,
+  pkgs,
+  ...
+}:
+
+stdenv.mkDerivation {
+  pname = "capnpc";
+  version = "1.0.1";
+
+  src = fetchFromGitHub {
+    owner = "shen390s";
+    repo = "c-capnproto";
+    rev = "master";
+    sha256 = "sha256-U+yUYYvfhPjvADtHsjN5LvOUzFEXZrTmmpqfypf/4Ik=";
+  };
+
+  nativeBuildInputs = [
+    pkgs.cmake
+    pkgs.ninja
+    pkgs.capnproto
+  ];
+
+  preConfigure = ''
+     cp "$src/CMakePresets.json" .
+  '';
+  
+  configurePhase = ''
+      cmake --preset=ci-linux_x86_64 -DBUILD_SHARED_LIBS=OFF -DBUILD_TESTING=OFF
+  '';
+  
+  buildPhase = ''
+      cmake --build --preset=ci-tests
+  '';           
+
+  installPhase = ''
+     mkdir -p $out/bin
+     mkdir -p $out/include
+     mkdir -p $out/lib
+     cp build/capnpc-c $out/bin
+     cp build/libCapnC_Runtime.a $out/lib
+     cp lib/capnp_c.h $out/include
+  '';
+}
diff --git a/pkgs/x/xbuild/package.nix b/pkgs/x/xbuild/package.nix
index c155e4d..72d747f 100644
--- a/pkgs/x/xbuild/package.nix
+++ b/pkgs/x/xbuild/package.nix
@@ -4,6 +4,7 @@
   stdenv,
   fetchFromGitHub,
   pkgs,
+  mypkgs,
   ...
 }:
 
@@ -17,7 +18,7 @@ let
       repo = "xbuild";
       rev = "master";
       #    sha256 = "sha256-DLq7vC+4k2TMy5jKvQkFTy+xZmpvl0+DiWcd7CBVbgw=";
-      sha256 =  "sha256-gYIYd3J4mCJJU0yJ+2xL/5URKo+M8T2Q9CWLbxQ2rtQ=";
+      sha256 =  "sha256-DD/ErN13ydDwYV5BhF81dJEkDIx1bAFQccDKxjkF+qw=";
     };
 
     nativeBuildInputs = [ 
@@ -52,6 +53,15 @@ let
       pkgs.linux-pam
       pkgs.libtirpc
       pkgs.hwloc
+      pkgs.libuv
+      pkgs.readline
+      pkgs.openssl
+      pkgs.libcyaml
+      pkgs.libyaml
+      pkgs.elogind
+      pkgs.sqlite
+      pkgs.python3
+      mypkgs.capnpc
     ];
 
     propagatedBuildInputs = [
@@ -64,7 +74,7 @@ let
          makeWrapper "$bin" "$out/bin/$(basename $bin)" \
             --prefix PATH : ${pkgs.lib.makeBinPath wrapped_xbuild.buildInputs} \
             --prefix PKG_CONFIG_PATH : ${pkgs.lib.makeSearchPathOutput "dev" "lib/pkgconfig" wrapped_xbuild.buildInputs} \
-	    --set AUTO_DETECT_PKG_CONFIG_PATH no 
+	          --set AUTO_DETECT_PKG_CONFIG_PATH no 
       done
     '';
   };