diff --git a/demo/Cargo.toml b/demo/Cargo.toml
new file mode 100644
index 0000000..5eb3be1
--- /dev/null
+++ b/demo/Cargo.toml
@@ -0,0 +1,7 @@
+[package]
+name = "demo"
+version = "0.1.0"
+edition = "2021"
+build = "build.rs"
+
+[dependencies]
diff --git a/demo/build.rs b/demo/build.rs
new file mode 100644
index 0000000..87ee1ab
--- /dev/null
+++ b/demo/build.rs
@@ -0,0 +1,18 @@
+use std::{
+    env,
+    error::Error,
+    fs::File,
+    io::{BufWriter, Write},
+    path::Path,
+};
+
+fn main() -> Result<(), Box<dyn Error>> {
+    let out_dir = env::var("OUT_DIR")?;
+    let dest_path = Path::new(&out_dir).join("long_string.txt");
+    let mut f = BufWriter::new(File::create(&dest_path)?);
+
+    let long_string = "abc".repeat(100);
+    write!(f, "{}", long_string)?;
+
+    Ok(())
+}
diff --git a/demo/src/main.rs b/demo/src/main.rs
new file mode 100644
index 0000000..728158b
--- /dev/null
+++ b/demo/src/main.rs
@@ -0,0 +1,5 @@
+static LONG_STRING: &'static str = include_str!(concat!(env!("OUT_DIR"), "/long_string.txt"));
+
+fn main() {
+    println!("This package was compiled at {}", LONG_STRING);
+}