diff --git a/crates/fluids/coolprop-sys/Cargo.toml b/crates/fluids/coolprop-sys/Cargo.toml
new file mode 100644
index 0000000..1fcdc43
--- /dev/null
+++ b/crates/fluids/coolprop-sys/Cargo.toml
@@ -0,0 +1,18 @@
+[package]
+name = "entropyk-coolprop-sys"
+version = "0.1.0"
+edition = "2021"
+description = "FFI bindings to CoolProp C++ library"
+
+[lints.rust]
+unsafe_code = "allow"
+
+[dependencies]
+libc = "0.2"
+
+[build-dependencies]
+cc = "1.0"
+
+[features]
+default = []
+static = []