diff --git a/Cargo.lock b/Cargo.lock
index fe179d14..fa9e7b05 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -109,6 +109,7 @@ version = "0.0.26"
 dependencies = [
  "aiken-lang",
  "askama",
+ "fslock",
  "hex",
  "ignore",
  "itertools",
@@ -455,6 +456,14 @@ name = "funty"
 version = "1.1.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "fed34cd105917e91daa4da6b3728c47b068749d6a62c59811f06ed2ac71d9da7"
+name = "fslock"
+version = "0.2.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "04412b8935272e3a9bae6f48c7bfff74c2911f60525404edfdd28e49884c3bfb"
+dependencies = [
+ "libc",
+ "winapi",
+]
 
 [[package]]
 name = "getrandom"
diff --git a/crates/project/Cargo.toml b/crates/project/Cargo.toml
index 01319cae..f2aa005c 100644
--- a/crates/project/Cargo.toml
+++ b/crates/project/Cargo.toml
@@ -11,6 +11,7 @@ authors = ["Lucas Rosa <x@rvcas.dev>", "Kasey White <kwhitemsg@gmail.com>"]
 [dependencies]
 aiken-lang = { path = "../lang", version = "0.0.26" }
 askama = "0.10.5"
+fslock = "0.2.1"
 hex = "0.4.3"
 ignore = "0.4.18"
 itertools = "0.10.1"
diff --git a/crates/project/src/deps.rs b/crates/project/src/deps.rs
new file mode 100644
index 00000000..3c91ce18
--- /dev/null
+++ b/crates/project/src/deps.rs
@@ -0,0 +1,41 @@
+use std::path::Path;
+
+use crate::{
+    error::Error,
+    paths,
+    telemetry::{Event, EventListener},
+};
+
+use self::manifest::Manifest;
+
+pub mod manifest;
+
+pub enum UseManifest {
+    Yes,
+    No,
+}
+
+pub fn download<T>(
+    event_listener: &T,
+    new_package: Option<(Vec<String>, bool)>,
+    use_manifest: UseManifest,
+    root_path: &Path,
+) -> Result<Manifest, Error>
+where
+    T: EventListener,
+{
+    let build_path = root_path.join(paths::build());
+
+    let mut build_lock = fslock::LockFile::open(&build_path).expect("Build Lock Creation");
+
+    if !build_lock
+        .try_lock_with_pid()
+        .expect("Trying build locking")
+    {
+        event_listener.handle_event(Event::WaitingForBuildDirLock);
+
+        build_lock.lock_with_pid().expect("Build locking")
+    }
+
+    todo!()
+}
diff --git a/crates/project/src/deps/manifest.rs b/crates/project/src/deps/manifest.rs
new file mode 100644
index 00000000..476ce65c
--- /dev/null
+++ b/crates/project/src/deps/manifest.rs
@@ -0,0 +1,17 @@
+use std::collections::HashMap;
+
+pub struct Manifest {
+    pub requirements: HashMap<String, String>,
+    pub packages: Vec<Package>,
+}
+
+pub struct Package {
+    pub name: String,
+    pub version: String,
+    pub requirements: Vec<String>,
+    pub source: PackageSource,
+}
+
+pub enum PackageSource {
+    GitHub { url: String },
+}
diff --git a/crates/project/src/lib.rs b/crates/project/src/lib.rs
index e89e4b67..3d286b2c 100644
--- a/crates/project/src/lib.rs
+++ b/crates/project/src/lib.rs
@@ -1,9 +1,11 @@
 pub mod config;
+pub mod deps;
 pub mod docs;
 pub mod error;
 pub mod format;
 pub mod module;
 pub mod options;
+pub mod paths;
 pub mod pretty;
 pub mod script;
 pub mod telemetry;
@@ -17,6 +19,7 @@ use aiken_lang::{
     uplc::CodeGenerator,
     IdGenerator,
 };
+use deps::UseManifest;
 use miette::NamedSource;
 use options::{CodeGenMode, Options};
 use pallas::{
@@ -148,6 +151,8 @@ where
     }
 
     pub fn compile(&mut self, options: Options) -> Result<(), Error> {
+        let manifest = deps::download(&self.event_listener, None, UseManifest::Yes, &self.root)?;
+
         self.event_listener
             .handle_event(Event::StartingCompilation {
                 root: self.root.clone(),
@@ -718,7 +723,7 @@ where
 
             let cbor_hex = hex::encode(&cbor);
 
-            fs::write(script_path, &cbor_hex)?;
+            fs::write(script_path, cbor_hex)?;
 
             // Create the payment script JSON file
             let payment_script_path = script_output_dir.join("payment_script.json");
diff --git a/crates/project/src/paths.rs b/crates/project/src/paths.rs
new file mode 100644
index 00000000..1610eab0
--- /dev/null
+++ b/crates/project/src/paths.rs
@@ -0,0 +1,5 @@
+use std::path::PathBuf;
+
+pub fn build() -> PathBuf {
+    PathBuf::from("build")
+}
diff --git a/crates/project/src/telemetry.rs b/crates/project/src/telemetry.rs
index 99c6265b..84502774 100644
--- a/crates/project/src/telemetry.rs
+++ b/crates/project/src/telemetry.rs
@@ -35,4 +35,5 @@ pub enum Event {
     FinishedTests {
         tests: Vec<EvalInfo>,
     },
+    WaitingForBuildDirLock,
 }