diff --git a/CMakeLists.txt b/CMakeLists.txt
index 6098595..02df2a7 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -5,19 +5,64 @@ project(BillySheet LANGUAGES CXX C)
 find_package(OpenGL REQUIRED)
 find_package(GLEW REQUIRED)
 
+# see https://cmake.org/cmake/help/latest/module/FindBoost.html
 find_package(Boost REQUIRED COMPONENTS stacktrace_addr2line)
 
 include_directories(${Boost_INCLUDE_DIR})
 
-file(GLOB_RECURSE SOURCE_HEADERS
-     include/*.h
-     include/*.hpp
-     external/ImFileDialog/*.h
+set(PRECOMPILE_HEADERS
+    include/gui/gui.hpp
+    include/gui/gui_data.hpp
+    include/gui/window.hpp
 )
 
-file(GLOB_RECURSE SOURCE_FILES
-     src/*.cpp
-     external/ImFileDialog/ImFileDialog.cpp
+set(SOURCE_HEADERS
+    include/imgui/imconfig.h
+    include/imgui/imgui.h
+    include/imgui/imgui_stdlib.h
+    include/imgui/imgui_impl_glfw.h
+    include/imgui/imgui_impl_opengl3.h
+    include/imgui/imgui_impl_opengl3_loader.h
+    include/imgui/imgui_internal.h
+    include/imgui/imstb_rectpack.h
+    include/imgui/imstb_textedit.h
+    include/imgui/imstb_truetype.h
+    include/stb_image.h
+    external/ImFileDialog/ImFileDialog.h
+    include/gui/gui.hpp
+    include/gui/gui_data.hpp
+    include/gui/window.hpp
+    include/character_sheet.hpp
+    include/characteristic/habilete.hpp
+    include/characteristic/adresse.hpp
+    include/characteristic/endurance.hpp
+    include/characteristic/chance.hpp
+    include/gui/menu/menu.hpp
+    include/gui/menu/menu_data.hpp
+    include/characteristic/characteristic.hpp
+    include/controller.hpp
+    include/gui_data_interface.hpp
+)
+
+set(SOURCE_FILES
+    src/imgui/imgui.cpp
+    src/imgui/imgui_stdlib.cpp
+    src/imgui/imgui_draw.cpp
+    src/imgui/imgui_impl_glfw.cpp
+    src/imgui/imgui_impl_opengl3.cpp
+    src/imgui/imgui_tables.cpp
+    src/imgui/imgui_widgets.cpp
+    external/ImFileDialog/ImFileDialog.cpp
+    src/main.cpp
+    src/gui/gui.cpp
+    src/gui/gui_data.cpp
+    src/gui/window.cpp
+    src/character_sheet.cpp
+    src/characteristic/adresse.cpp
+    src/characteristic/endurance.cpp
+    src/characteristic/chance.cpp
+    src/gui/menu/menu.cpp
+    src/controller.cpp
 )
 
 set(SOURCES
@@ -124,6 +169,7 @@ set_target_properties(glfw PROPERTIES
 
 set_target_properties(spdlog PROPERTIES UNITY_BUILD ON)
 
+target_precompile_headers(BillySheet PRIVATE ${PRECOMPILE_HEADERS})
 target_compile_definitions(BillySheet PRIVATE
                            $<$<CONFIG:Debug>:_GLIBCXX_DEBUG>
                            $<$<CONFIG:Debug>:SPDLOG_ACTIVE_LEVEL=SPDLOG_LEVEL_DEBUG>