fix: build script

fuel-zkvm-primitives-test-fixtures/Cargo.toml

@@ -25,6 +25,10 @@ tempfile = "3.14.0"
 tokio = { workspace = true }
 clap = { version = "^4.0", features = ["derive"], optional = true }
 enum-iterator = { version = "2.1.0", optional = true }
+which = "7.0.0"
+
+[build-dependencies]
+which = "7.0.0"
 
 [dev-dependencies]
 paste = "1.0"

fuel-zkvm-primitives-test-fixtures/build.rs

@@ -1,10 +1,25 @@
+use std::env;
+use std::path::Path;
 use std::process::Command;
 
 pub fn main() {
-    Command::new("forc")
+    // Check if `forc` is available in the system PATH
+    let forc_binary = which::which("forc").unwrap_or_else(|_| {
+        // If `forc` is not found in PATH, check $HOME/.fuelup/bin/forc
+        let home_dir = env::var("HOME").expect("Failed to get $HOME directory");
+        let fallback_path = Path::new(&home_dir).join(".fuelup/bin/forc");
+        if fallback_path.exists() {
+            fallback_path
+        } else {
+            panic!("`forc` binary not found in PATH or at $HOME/.fuelup/bin/forc");
+        }
+    });
+
+    // Use the determined `forc` binary to build the contract
+    Command::new(forc_binary)
         .arg("build")
         .arg("--path")
         .arg("src/fixtures/counter_contract")
         .spawn()
-        .expect("failed to build contract");
-}
+        .expect("Failed to build contract");
+}