diff --git a/CMakeLists.txt b/CMakeLists.txt
index f46c072..13efa1c 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -37,8 +37,6 @@ endif()
 
 set(cdroot ${CMAKE_BINARY_DIR}/cdimg)
 file(MAKE_DIRECTORY ${cdroot})
-# Avoid C11 since it is not supported by the i386-mingw32 toolchain.
-set(cflags -Wall -g3 -ffunction-sections -fdata-sections -pedantic -std=c99)
 
 if(PS1_BUILD)
     include("cmake/ps1.cmake")
@@ -49,48 +47,4 @@ elseif(HOST_BUILD)
 endif()
 
 add_subdirectory("res")
-
-set(components
-    building
-    camera
-    container
-    font
-    game
-    gfx
-    gui
-    header
-    instance
-    keyboard
-    menu
-    mouse
-    pad
-    peripheral
-    player
-    resource
-    sfx
-    system
-    terrain
-    unit
-    util
-)
-
-set(interfaces
-    tech
-)
-
-target_compile_options(${PROJECT_NAME} PUBLIC ${cflags})
-# Dependencies for main.c
-target_link_libraries(${PROJECT_NAME} PRIVATE system menu)
-
-foreach(c ${components})
-    add_subdirectory("src/${c}")
-    target_compile_options(${c} PUBLIC ${cflags})
-endforeach()
-
-foreach(i ${interfaces})
-    add_subdirectory("src/${i}")
-    target_compile_options(${i} INTERFACE ${cflags})
-    target_link_libraries(${PROJECT_NAME} PRIVATE ${c})
-endforeach()
-
-target_link_options(${PROJECT_NAME} PRIVATE -Wl,--gc-sections)
+add_subdirectory("src")
diff --git a/src/CMakeLists.txt b/src/CMakeLists.txt
new file mode 100644
index 0000000..ba57b6f
--- /dev/null
+++ b/src/CMakeLists.txt
@@ -0,0 +1,47 @@
+# Avoid C11 since it is not supported by the i386-mingw32 toolchain.
+set(cflags -Wall -g3 -ffunction-sections -fdata-sections -pedantic -std=c99)
+
+set(components
+    building
+    camera
+    container
+    font
+    game
+    gfx
+    gui
+    header
+    instance
+    keyboard
+    menu
+    mouse
+    pad
+    peripheral
+    player
+    resource
+    sfx
+    system
+    terrain
+    unit
+    util
+)
+
+set(interfaces
+    tech
+)
+
+target_compile_options(${PROJECT_NAME} PUBLIC ${cflags})
+# Dependencies for main.c
+target_link_libraries(${PROJECT_NAME} PRIVATE system menu)
+
+foreach(c ${components})
+    add_subdirectory("${c}")
+    target_compile_options(${c} PUBLIC ${cflags})
+endforeach()
+
+foreach(i ${interfaces})
+    add_subdirectory("${i}")
+    target_compile_options(${i} INTERFACE ${cflags})
+    target_link_libraries(${PROJECT_NAME} PRIVATE ${c})
+endforeach()
+
+target_link_options(${PROJECT_NAME} PRIVATE -Wl,--gc-sections)