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++checksum = "cccddf32554fecc6acb585f82a32a72e28b48f8c4c1883ddfeeeaa96f7d8e519"
++
++[[package]]
++name = "winapi"
++version = "0.3.9"
++source = "registry+https://github.com/rust-lang/crates.io-index"
++checksum = "5c839a674fcd7a98952e593242ea400abe93992746761e38641405d28b00f419"
++dependencies = [
++ "winapi-i686-pc-windows-gnu",
++ "winapi-x86_64-pc-windows-gnu",
++]
++
++[[package]]
++name = "winapi-i686-pc-windows-gnu"
++version = "0.4.0"
++source = "registry+https://github.com/rust-lang/crates.io-index"
++checksum = "ac3b87c63620426dd9b991e5ce0329eff545bccbbb34f3be09ff6fb6ab51b7b6"
++
++[[package]]
++name = "winapi-x86_64-pc-windows-gnu"
++version = "0.4.0"
++source = "registry+https://github.com/rust-lang/crates.io-index"
++checksum = "712e227841d057c1ee1cd2fb22fa7e5a5461ae8e48fa2ca79ec42cfc1931183f"
diff --git a/packages/notcoal/default.nix b/packages/notcoal/default.nix
new file mode 100644
index 0000000..e571836
--- /dev/null
+++ b/packages/notcoal/default.nix
@@ -0,0 +1,27 @@
+{ lib, stdenv, rustPlatform, notmuch, bash }:
+
+rustPlatform.buildRustPackage rec {
+  pname = "notcoal";
+  version = "0.3.0";
+
+  src = fetchTarball {
+    url = https://ghom.niij.org/eaon/notcoal/archive/v0.3.0.tar.gz;
+    sha256 = "19gaba6asid5vplcy9q0ama40dvwwxglc40ks5240lydrvgfrimq";
+  };
+  cargoPatches = [
+    ./Cargo.lock.patch
+  ];
+  cargoSha256 = "0kgjxq2319l2gh1xc0f3ir1pa6z7p62z3fccswwxrz7gbn7nc07c";
+  cargoBuildFlags = ["--feature=standalone"];
+
+  buildInputs = [
+    bash
+    notmuch
+  ];
+
+
+  meta = with stdenv.lib; {
+    description = "An email tagger for notmuch";
+    homepage = "https://ghom.niij.org/eaon/notcoal";
+  };
+}
diff --git a/roles/mail.nix b/roles/mail.nix
index 9aabab4..93f6a3f 100644
--- a/roles/mail.nix
+++ b/roles/mail.nix
@@ -1,6 +1,8 @@
 { config, lib, pkgs, ... }:
 
-{
+let
+  notcoal = pkgs.callPackage (import ../packages/notcoal) {};
+in {
   environment.systemPackages = with pkgs; [
     astroid
     isync