that might be the fix

libcsp-cargo-build/src/lib.rs

@@ -49,6 +49,7 @@ impl Builder {
             .file("libcsp/src/csp_debug.c")
             .file("libcsp/src/csp_id.c")
             .file("libcsp/src/csp_iflist.c")
+            .file("libcsp/src/csp_conn.c")
             .file("libcsp/src/csp_init.c")
             .file("libcsp/src/csp_io.c")
             .file("libcsp/src/csp_port.c")

libcsp-rust/build.rs

@@ -27,7 +27,8 @@ fn main() {
     // Tell cargo to tell rustc to link our `csp` library. Cargo will
     // automatically know it must look for a `libcsp.a` file.
     println!("cargo:rustc-link-lib=csp");
-    println!("cargo:rustc-link-search={}/csp", project_dir);
+    println!("cargo:rustc-link-lib=csp");
+    // println!("cargo:rustc-link-search={}/csp", project_dir);
 
     let mut csp_builder = Builder::new();
     csp_builder.compile();

libcsp-rust/src/lib.rs

@@ -2,6 +2,13 @@
 #![allow(non_camel_case_types)]
 #![allow(non_snake_case)]
 
+// include!(concat!(env!("OUT_DIR"), "/bindings.rs"));
+extern "C" {
+    pub fn csp_print_func(fmt: *const ::std::os::raw::c_char, ...);
+    #[doc = " Initialize CSP.\n This will configure basic structures."]
+    pub fn csp_init();
+}
+
 // include!(concat!(env!("OUT_DIR"), "/bindings.rs"));
 // extern "C" {
     // pub fn csp_print_func(fmt: *const ::std::os::raw::c_char, ...);

libcsp-rust/src/main.rs

@@ -1,9 +1,4 @@
-// include!(concat!(env!("OUT_DIR"), "/bindings.rs"));
+use libcsp_rust::csp_init;
-extern "C" {
-    pub fn csp_print_func(fmt: *const ::std::os::raw::c_char, ...);
-    #[doc = " Initialize CSP.\n This will configure basic structures."]
-    pub fn csp_init();
-}
 
 fn main() {
     println!("Hello, world!");