diff --git a/.gitmodules b/.gitmodules
new file mode 100644
index 0000000..3f927f1
--- /dev/null
+++ b/.gitmodules
@@ -0,0 +1,3 @@
+[submodule "extern/argh"]
+	path = extern/argh
+	url = https://github.com/adishavit/argh.git
diff --git a/CMakeLists.txt b/CMakeLists.txt
index 4367b9c..0d05b6e 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -1,15 +1,22 @@
+cmake_minimum_required(VERSION 3.20)
+
 project(
   contour-creator
   LANGUAGES CXX)    
   
-find_package(GDAL CONFIG REQUIRED)
-
 add_executable(${PROJECT_NAME}
 	src/HeightMap.cpp src/CellMap.cpp src/main.cpp
 )
+
+# Argh is a simple argrument parser
+add_subdirectory(extern/argh)
+target_link_libraries(${PROJECT_NAME} PRIVATE argh)
+
+# Gdal is used for geodata IO
+find_package(GDAL CONFIG REQUIRED)
+target_link_libraries(${PROJECT_NAME} PRIVATE GDAL::GDAL)
+
 find_package(OpenMP)
 if(OpenMP_CXX_FOUND)
     target_link_libraries(${PROJECT_NAME} PUBLIC OpenMP::OpenMP_CXX)
-endif()
-
-target_link_libraries(${PROJECT_NAME} GDAL::GDAL)
\ No newline at end of file
+endif()
\ No newline at end of file
diff --git a/extern/argh b/extern/argh
new file mode 160000
index 0000000..431bf32
--- /dev/null
+++ b/extern/argh
@@ -0,0 +1 @@
+Subproject commit 431bf323acd3bb805483491ff277dac5d85772ad