diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index 8566e2c..eb8c833 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -28,6 +28,7 @@ jobs:
             ${{ runner.os }}-cargo-${{ steps.rust-toolchain.outputs.cachekey }}-check-
             ${{ runner.os }}-cargo-${{ steps.rust-toolchain.outputs.cachekey }}-
             ${{ runner.os }}-cargo-
+      - run: cargo check --all-targets --no-default-features --features protoc
       - run: cargo check --all-targets --all-features
 
   check:
@@ -53,6 +54,7 @@ jobs:
             ${{ runner.os }}-cargo-${{ steps.rust-toolchain.outputs.cachekey }}-check-
             ${{ runner.os }}-cargo-${{ steps.rust-toolchain.outputs.cachekey }}-
             ${{ runner.os }}-cargo-
+      - run: cargo check --all-targets --no-default-features --features protoc
       - run: cargo check --all-targets --all-features
 
   test:
@@ -78,8 +80,10 @@ jobs:
             ${{ runner.os }}-cargo-${{ steps.rust-toolchain.outputs.cachekey }}-test-
             ${{ runner.os }}-cargo-${{ steps.rust-toolchain.outputs.cachekey }}-
             ${{ runner.os }}-cargo-
+      - run: cargo test --all-targets --no-default-features --features protoc
       - run: cargo test --all-targets --all-features
       - run: cargo test --doc --all-features
+      - run: cargo test --doc --no-default-features --features protoc
 
   rustfmt:
     name: Rustfmt
@@ -116,6 +120,7 @@ jobs:
             ${{ runner.os }}-cargo-${{ steps.rust-toolchain.outputs.cachekey }}-clippy-
             ${{ runner.os }}-cargo-${{ steps.rust-toolchain.outputs.cachekey }}-
             ${{ runner.os }}-cargo-
+      - run: cargo clippy --all-targets --no-default-features --features  protoc -- -Dwarnings
       - run: cargo clippy --all-targets --all-features -- -Dwarnings
 
   package:
diff --git a/build.rs b/build.rs
index b48105b..a323874 100644
--- a/build.rs
+++ b/build.rs
@@ -280,7 +280,7 @@ fn main() -> Result<(), Box<dyn Error>> {
     // for use in docker build where file changes can be wonky
     println!("cargo:rerun-if-env-changed=FORCE_REBUILD");
 
-    let version = substrait_version()?;
+    let _version = substrait_version()?;
 
     #[cfg(feature = "protoc")]
     std::env::set_var("PROTOC", protobuf_src::protoc());
@@ -290,7 +290,7 @@ fn main() -> Result<(), Box<dyn Error>> {
     text(out_dir.as_path())?;
 
     #[cfg(feature = "extensions")]
-    extensions(version, out_dir.as_path())?;
+    extensions(_version, out_dir.as_path())?;
 
     let protos = WalkDir::new(PROTO_ROOT)
         .into_iter()
diff --git a/src/lib.rs b/src/lib.rs
index 0639d09..508f838 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -69,6 +69,7 @@
 //!
 //! #### Read a simple extension
 //! ```rust
+//! # #[cfg(feature="extensions")]
 //! # fn main() -> Result<(), serde_yaml::Error> {
 //! use substrait::text::simple_extensions::SimpleExtensions;
 //!
@@ -96,6 +97,8 @@
 //! assert_eq!(simple_extension.scalar_functions.len(), 1);
 //! assert_eq!(simple_extension.scalar_functions[0].name, "add");
 //! # Ok(()) }
+//! # #[cfg(not(feature="extensions"))]
+//! # fn main() {}
 //! ```
 //!
 //! [pbjson]: https://docs.rs/pbjson