diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..d26d06b
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,2 @@
+/build/*
+!/build/.gitkeep
diff --git a/CMakeLists.txt b/CMakeLists.txt
index 52e8fef..08bb3dc 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -1,7 +1,7 @@
 cmake_minimum_required(VERSION 3.13)
 
-set(PICO_SDK_PATH lib/pico-sdk)
-include(lib/pico-sdk/external/pico_sdk_import.cmake)
+set(PICO_SDK_PATH ${CMAKE_SOURCE_DIR}/lib/pico-sdk/)
+include(${PICO_SDK_PATH}/external/pico_sdk_import.cmake)
 
 project(vibe-check)
 
diff --git a/build/.gitkeep b/build/.gitkeep
new file mode 100644
index 0000000..e69de29
diff --git a/shell.nix b/shell.nix
index f057545..0cbb3f0 100644
--- a/shell.nix
+++ b/shell.nix
@@ -1,6 +1,6 @@
 { pkgs ? import <nixpkgs> {} }:
 pkgs.mkShell {
   buildInputs = with pkgs; [
-    cmake python3 gcc-arm-embedded
+    cmake ninja python3 gcc-arm-embedded
   ];
 }