diff --git a/Cargo.lock b/Cargo.lock
index ddb248c..efab024 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -15,6 +15,8 @@ dependencies = [
  "bitflags",
  "bok-macro",
  "paste",
+ "proc-macro2",
+ "quote",
 ]
 
 [[package]]
diff --git a/bok-macro/src/lib.rs b/bok-macro/src/lib.rs
index 56a5af7..f1f79d5 100644
--- a/bok-macro/src/lib.rs
+++ b/bok-macro/src/lib.rs
@@ -271,7 +271,20 @@ pub fn derive_package(input: TokenStream) -> TokenStream {
     let non_opt_types2 = non_opt_types.clone();
 
     let expanded = quote! {
-        impl ::bok::Pkg for #name {}
+        impl ::bok::Pkg for #name {
+            fn base(&self) -> Option<&impl ::bok::Pkg> {
+                Some(&self.base)
+            }
+        }
+        impl ::core::fmt::Display for #name {
+            fn fmt(&self, f: &mut ::core::fmt::Formatter<'_>)
+                ->::core::fmt::Result
+            {
+                use ::bok::Pkg;
+                let pkg = self.package();
+                pkg.fmt(f)
+            }
+        }
         impl #name {
             pub fn builder() -> #name_builder {
                 #name_builder {
diff --git a/bok/Cargo.toml b/bok/Cargo.toml
index 7ec74da..df25687 100644
--- a/bok/Cargo.toml
+++ b/bok/Cargo.toml
@@ -16,6 +16,8 @@ publish = false
 [dependencies]
 paste = "1.0"
 bitflags = "2.4"
+proc-macro2 = "1.0"
+quote = "1.0"
 
 [dev-dependencies]
 bok-macro = { path="../bok-macro" }
diff --git a/bok/src/lib.rs b/bok/src/lib.rs
index 69dbc90..b958b02 100644
--- a/bok/src/lib.rs
+++ b/bok/src/lib.rs
@@ -82,42 +82,63 @@ pub struct RepositoryEmpty {}
 impl Repository for RepositoryEmpty {}
 
 /// Implement common package operations
-pub trait Pkg: ::std::default::Default {
-    /*
-    fn prepare_pre();
-    fn prepare();
-    fn prepare_post();
-    fn configure_pre();
-    fn configure();
-    fn configure_post();
-    fn build_pre();
-    fn build();
-    fn build_post();
-    fn check_pre();
-    fn check();
-    fn check_post();
-    fn install_pre();
-    fn install();
-    fn install_post();
-    */
-    /*
-    fn build_base(&mut self) {
-        Self::base::default()
+pub trait Pkg: ::std::default::Default + ::core::fmt::Display {
+    fn base(&self) -> Option<&impl Pkg>;
+    fn prepare(&self) -> ::proc_macro2::TokenStream {
+        self.base().unwrap().prepare()
     }
-    */
-    /*
-    fn as_any(&self) -> &dyn Any
-    where
-        Self: Sized,
-    {
-        self
+    fn configure(&self) -> ::proc_macro2::TokenStream {
+        self.base().unwrap().configure()
+    }
+    fn build(&self) -> ::proc_macro2::TokenStream {
+        self.base().unwrap().build()
+    }
+    fn check(&self) -> ::proc_macro2::TokenStream {
+        self.base().unwrap().check()
+    }
+    fn install(&self) -> ::proc_macro2::TokenStream {
+        self.base().unwrap().install()
+    }
+    fn package(&self) -> ::proc_macro2::TokenStream {
+        let mut all = self.prepare();
+        all.extend(self.configure());
+        all.extend(self.build());
+        all.extend(self.check());
+        all.extend(self.install());
+        all
     }
-    */
 }
 
 #[derive(Default)]
 pub struct PkgEmpty {}
 
+impl ::core::fmt::Display for PkgEmpty {
+    fn fmt(&self, f: &mut ::core::fmt::Formatter<'_>) -> ::core::fmt::Result {
+        Ok(())
+    }
+}
+
+impl Pkg for PkgEmpty {
+    fn base(&self) -> Option<&impl Pkg> {
+        None::<Self>.as_ref()
+    }
+    fn prepare(&self) -> ::proc_macro2::TokenStream {
+        ::quote::quote! {}
+    }
+    fn configure(&self) -> ::proc_macro2::TokenStream {
+        ::quote::quote! {}
+    }
+    fn build(&self) -> ::proc_macro2::TokenStream {
+        ::quote::quote! {}
+    }
+    fn check(&self) -> ::proc_macro2::TokenStream {
+        ::quote::quote! {}
+    }
+    fn install(&self) -> ::proc_macro2::TokenStream {
+        ::quote::quote! {}
+    }
+}
+
 ::bitflags::bitflags! {
     /// In each package, what we can build and how
     #[repr(transparent)]