feat: some nix shit

package/c/watch/default.nix

@@ -0,0 +1,30 @@
+{ stdenv, gcc, lib, hectic, bash }:
+
+stdenv.mkDerivation {
+  pname = "watch";
+  version = "1.0";
+  src = ./.;
+  doCheck = true;
+
+  nativeBuildInputs = [ gcc gdb ];
+
+  buildPhase = ''
+    ${bash}/bin/sh ./make.sh build
+  '';
+
+  checkPhase = ''
+    ${bash}/bin/sh ./make.sh check
+  '';
+
+  installPhase = ''
+    mkdir -p $out/bin $out/lib $out/include
+    cp target/hmpl $out/bin/hmpl
+    cp target/libhmpl.a $out/lib/
+    cp hmpl.h $out/include/hmpl.h
+  '';
+
+  meta = {
+    description = "watch";
+    license = lib.licenses.mit;
+  };
+}