Skeleton with libschrift submodule and compilation.

.gitignore

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+/target
+.*.swp
+/Cargo.lock

.gitmodules

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+[submodule "libschrift"]
+	path = libschrift
+	url = https://github.com/tomolt/libschrift

Cargo.toml

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+[package]
+name = "schrift-rs"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[build-dependencies]
+cc = "1.0"

build.rs

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+fn main() {
+    cc::Build::new()
+        .flag("-std=c99")
+        .flag("-pedantic")
+        .file("libschrift/schrift.c")
+        .compile("schrift");
+}

libschrift

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+Subproject commit 8e533fd07acc2f8ae4cffe7f95d2c3392773e2b5

src/lib.rs

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+pub fn add(left: usize, right: usize) -> usize {
+    left + right
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn it_works() {
+        let result = add(2, 2);
+        assert_eq!(result, 4);
+    }
+}