diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..917166f
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,2 @@
+# Bỏ qua thư mục build/
+build/
diff --git a/CMakeLists.txt b/CMakeLists.txt
index 66c7d2e..8be9313 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -4,6 +4,7 @@ project(robot_time LANGUAGES CXX)
 set(CMAKE_CXX_STANDARD 17)
 set(CMAKE_CXX_STANDARD_REQUIRED ON)
 set(CMAKE_CXX_EXTENSIONS OFF)
+set(CMAKE_POSITION_INDEPENDENT_CODE ON)
 
 find_package(GTest REQUIRED)