fix(build): improve error message when cmake is not found

Author: jaoleal

libbitcoinkernel-sys/build.rs

@@ -17,7 +17,7 @@ fn main() {
 
     let build_config = "RelWithDebInfo";
 
-    Command::new("cmake")
+    let configure_status = Command::new("cmake")
         .arg("-B")
         .arg(&build_dir)
         .arg("-S")
@@ -42,14 +42,14 @@ fn main() {
         .arg("-DENABLE_IPC=OFF")
         .arg(format!("-DCMAKE_INSTALL_PREFIX={}", install_dir.display()))
         .status()
-        .unwrap();
+        .expect("cmake should be installed and available in PATH.");
 
     let num_jobs = env::var("NUM_JOBS")
         .ok()
         .and_then(|v| v.parse::<u32>().ok())
         .unwrap_or(1); // Default to 1 if not set
 
-    Command::new("cmake")
+    let build_status = Command::new("cmake")
         .arg("--build")
         .arg(&build_dir)
         .arg("--config")
@@ -58,14 +58,13 @@ fn main() {
         .status()
         .unwrap();
 
-    Command::new("cmake")
+    let install_status = Command::new("cmake")
         .arg("--install")
         .arg(&build_dir)
         .arg("--config")
         .arg(build_config)
         .status()
         .unwrap();
-
     // Check if the build system used a multi-config generator
     let lib_dir = if install_dir.join("lib").join(build_config).exists() {
         install_dir.join("lib").join(build_config)