fix: Resolve libvalhalla system dependencies

Author: kinkard

Cargo.lock

@@ -14,4 +14,5 @@ cxx = "1.0"
 [build-dependencies]
 cmake = "0.1"
 cxx-build = "1.0"
-miniserde = "0.1" # For compile_commands.json parsing
+miniserde = "0.1"     # For compile_commands.json parsing
+pkg-config = "0.3.32"

Cargo.toml

@@ -32,10 +32,14 @@ fn main() {
 
     let valhalla_includes = extract_includes(&dst.join("build/compile_commands.json"), "config.cc");
 
-    // Manually link valhalla because `cmake` crate doesn't fetch the mystery about who depends on what from cmake
+    // Link Valhalla and its requirements via libvalhalla.pc file, generated by cmake
     let dst = dst.display().to_string();
     println!("cargo:rustc-link-search={dst}/build/src/");
-    println!("cargo:rustc-link-lib=valhalla");
+    pkg_config::Config::new()
+        .arg("--with-path")
+        .arg(format!("{dst}/build"))
+        .probe("libvalhalla")
+        .unwrap();
 
     // bindings
     cxx_build::bridge("src/lib.rs")