diff --git a/CMakeLists.txt b/CMakeLists.txt
index 47f6ce9..d69cd1d 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -23,97 +23,103 @@ if(MINGW)
     set(CMAKE_FIND_LIBRARY_SUFFIXES .a ${CMAKE_FIND_LIBRARY_SUFFIXES}) # This _shouldn't_ be needed, but, anything's possible...
 endif()
 
-set(CORRADE_BUILD_DEPRECATED OFF CACHE BOOL "" FORCE)
-set(CORRADE_BUILD_STATIC ON CACHE BOOL "" FORCE)
-set(CORRADE_BUILD_STATIC_PIC ON CACHE BOOL "" FORCE)
-set(CORRADE_BUILD_STATIC_UNIQUE_GLOBALS OFF CACHE BOOL "" FORCE)
-set(CORRADE_BUILD_TESTS OFF CACHE BOOL "" FORCE)
-set(CORRADE_WITH_INTERCONNECT OFF CACHE BOOL "" FORCE)
-set(CORRADE_WITH_PLUGINMANAGER OFF CACHE BOOL "" FORCE)
-set(CORRADE_WITH_TESTSUITE OFF CACHE BOOL "" FORCE)
-set(CORRADE_WITH_MAIN ON CACHE BOOL "" FORCE)
-set(CORRADE_UTILITY_USE_ANSI_COLORS ON CACHE BOOL "" FORCE)
-add_subdirectory(third-party/corrade EXCLUDE_FROM_ALL)
+option(SAVETOOL_USE_SYSTEM_LIBS "Use system-wide versions of the dependencies instead of the versions provided by submodules." OFF)
 
-set(BUILD_SHARED_LIBS OFF CACHE BOOL "" FORCE)
-set(DIRECTX OFF CACHE BOOL "" FORCE) # We use OpenGL.
-set(SDL_ATOMIC OFF CACHE BOOL "" FORCE)
-set(SDL_CPUINFO OFF CACHE BOOL "" FORCE)
-set(SDL_EVENTS ON CACHE BOOL "" FORCE)
-set(SDL_FILE OFF CACHE BOOL "" FORCE)
-set(SDL_FILESYSTEM OFF CACHE BOOL "" FORCE)
-set(SDL_HAPTIC OFF CACHE BOOL "" FORCE)
-set(SDL_LOCALE OFF CACHE BOOL "" FORCE)
-set(SDL_POWER OFF CACHE BOOL "" FORCE)
-set(SDL_RENDER OFF CACHE BOOL "" FORCE)
-set(SDL_SENSOR OFF CACHE BOOL "" FORCE)
-set(SDL_THREADS ON CACHE BOOL "" FORCE)
-set(SDL_TIMERS ON CACHE BOOL "" FORCE)
-set(SDL_SHARED OFF CACHE BOOL "" FORCE)
-add_subdirectory(third-party/SDL EXCLUDE_FROM_ALL)
+if(SAVETOOL_USE_SYSTEM_LIBS)
+    # Generic variables shared by multiple libs that don't provide their own.
+    set(BUILD_SHARED_LIBS OFF CACHE BOOL "" FORCE)
+    set(BUILD_TESTING OFF CACHE BOOL "" FORCE)
 
-set(MAGNUM_BUILD_STATIC ON CACHE BOOL "" FORCE)
-set(MAGNUM_BUILD_STATIC_PIC ON CACHE BOOL "" FORCE)
-set(MAGNUM_BUILD_STATIC_UNIQUE_GLOBALS OFF CACHE BOOL "" FORCE)
-set(MAGNUM_BUILD_DEPRECATED OFF CACHE BOOL "" FORCE)
-set(MAGNUM_BUILD_TESTS OFF CACHE BOOL "" FORCE)
+    set(CORRADE_BUILD_DEPRECATED OFF CACHE BOOL "" FORCE)
+    set(CORRADE_BUILD_STATIC ON CACHE BOOL "" FORCE)
+    set(CORRADE_BUILD_STATIC_PIC ON CACHE BOOL "" FORCE)
+    set(CORRADE_BUILD_STATIC_UNIQUE_GLOBALS OFF CACHE BOOL "" FORCE)
+    set(CORRADE_BUILD_TESTS OFF CACHE BOOL "" FORCE)
+    set(CORRADE_WITH_INTERCONNECT OFF CACHE BOOL "" FORCE)
+    set(CORRADE_WITH_PLUGINMANAGER OFF CACHE BOOL "" FORCE)
+    set(CORRADE_WITH_TESTSUITE OFF CACHE BOOL "" FORCE)
+    set(CORRADE_WITH_MAIN ON CACHE BOOL "" FORCE)
+    set(CORRADE_UTILITY_USE_ANSI_COLORS ON CACHE BOOL "" FORCE)
+    add_subdirectory(third-party/corrade EXCLUDE_FROM_ALL)
 
-set(MAGNUM_TARGET_GL ON CACHE BOOL "" FORCE)
-set(MAGNUM_TARGET_GLES OFF CACHE BOOL "" FORCE)
-set(MAGNUM_TARGET_VK OFF CACHE BOOL "" FORCE)
-set(MAGNUM_WITH_AUDIO OFF CACHE BOOL "" FORCE)
-set(MAGNUM_WITH_DEBUGTOOLS OFF CACHE BOOL "" FORCE)
-set(MAGNUM_WITH_GL ON CACHE BOOL "" FORCE)
-set(MAGNUM_WITH_MATERIALTOOLS OFF CACHE BOOL "" FORCE)
-set(MAGNUM_WITH_MESHTOOLS OFF CACHE BOOL "" FORCE)
-set(MAGNUM_WITH_PRIMITIVES OFF CACHE BOOL "" FORCE)
-set(MAGNUM_WITH_SCENEGRAPH OFF CACHE BOOL "" FORCE)
-set(MAGNUM_WITH_SCENETOOLS OFF CACHE BOOL "" FORCE)
-set(MAGNUM_WITH_SHADERS ON CACHE BOOL "" FORCE)
-set(MAGNUM_WITH_SHADERTOOLS OFF CACHE BOOL "" FORCE)
-set(MAGNUM_WITH_TEXT OFF CACHE BOOL "" FORCE)
-set(MAGNUM_WITH_TEXTURETOOLS OFF CACHE BOOL "" FORCE)
-set(MAGNUM_WITH_TRADE OFF CACHE BOOL "" FORCE)
-set(MAGNUM_WITH_VK OFF CACHE BOOL "" FORCE)
-set(MAGNUM_WITH_SDL2APPLICATION ON CACHE BOOL "" FORCE)
-add_subdirectory(third-party/magnum EXCLUDE_FROM_ALL)
+    set(DIRECTX OFF CACHE BOOL "" FORCE) # We use OpenGL.
+    set(SDL_ATOMIC OFF CACHE BOOL "" FORCE)
+    set(SDL_CPUINFO OFF CACHE BOOL "" FORCE)
+    set(SDL_EVENTS ON CACHE BOOL "" FORCE)
+    set(SDL_FILE OFF CACHE BOOL "" FORCE)
+    set(SDL_FILESYSTEM OFF CACHE BOOL "" FORCE)
+    set(SDL_HAPTIC OFF CACHE BOOL "" FORCE)
+    set(SDL_LOCALE OFF CACHE BOOL "" FORCE)
+    set(SDL_POWER OFF CACHE BOOL "" FORCE)
+    set(SDL_RENDER OFF CACHE BOOL "" FORCE)
+    set(SDL_SENSOR OFF CACHE BOOL "" FORCE)
+    set(SDL_THREADS ON CACHE BOOL "" FORCE)
+    set(SDL_TIMERS ON CACHE BOOL "" FORCE)
+    set(SDL_SHARED OFF CACHE BOOL "" FORCE)
+    add_subdirectory(third-party/SDL EXCLUDE_FROM_ALL)
 
-set(IMGUI_DIR ${CMAKE_CURRENT_SOURCE_DIR}/third-party/imgui)
-set(MAGNUM_WITH_IMGUI ON CACHE BOOL "" FORCE)
-add_subdirectory(third-party/magnum-integration EXCLUDE_FROM_ALL)
+    set(MAGNUM_BUILD_STATIC ON CACHE BOOL "" FORCE)
+    set(MAGNUM_BUILD_STATIC_PIC ON CACHE BOOL "" FORCE)
+    set(MAGNUM_BUILD_STATIC_UNIQUE_GLOBALS OFF CACHE BOOL "" FORCE)
+    set(MAGNUM_BUILD_DEPRECATED OFF CACHE BOOL "" FORCE)
+    set(MAGNUM_BUILD_TESTS OFF CACHE BOOL "" FORCE)
 
-set(ENABLE_COMMONCRYPTO OFF CACHE BOOL "" FORCE)
-set(ENABLE_GNUTLS OFF CACHE BOOL "" FORCE)
-set(ENABLE_MBEDTLS OFF CACHE BOOL "" FORCE)
-set(ENABLE_OPENSSL OFF CACHE BOOL "" FORCE)
-set(ENABLE_WINDOWS_CRYPTO OFF CACHE BOOL "" FORCE)
-set(ENABLE_BZIP2 OFF CACHE BOOL "" FORCE)
-set(ENABLE_LZMA OFF CACHE BOOL "" FORCE)
-set(ENABLE_ZSTD OFF CACHE BOOL "" FORCE)
-set(BUILD_TOOLS OFF CACHE BOOL "" FORCE)
-set(BUILD_REGRESS OFF CACHE BOOL "" FORCE)
-set(BUILD_EXAMPLES OFF CACHE BOOL "" FORCE)
-set(BUILD_DOC OFF CACHE BOOL "" FORCE)
-add_subdirectory(third-party/libzip EXCLUDE_FROM_ALL)
+    set(MAGNUM_TARGET_GL ON CACHE BOOL "" FORCE)
+    set(MAGNUM_TARGET_GLES OFF CACHE BOOL "" FORCE)
+    set(MAGNUM_TARGET_VK OFF CACHE BOOL "" FORCE)
+    set(MAGNUM_WITH_AUDIO OFF CACHE BOOL "" FORCE)
+    set(MAGNUM_WITH_DEBUGTOOLS OFF CACHE BOOL "" FORCE)
+    set(MAGNUM_WITH_GL ON CACHE BOOL "" FORCE)
+    set(MAGNUM_WITH_MATERIALTOOLS OFF CACHE BOOL "" FORCE)
+    set(MAGNUM_WITH_MESHTOOLS OFF CACHE BOOL "" FORCE)
+    set(MAGNUM_WITH_PRIMITIVES OFF CACHE BOOL "" FORCE)
+    set(MAGNUM_WITH_SCENEGRAPH OFF CACHE BOOL "" FORCE)
+    set(MAGNUM_WITH_SCENETOOLS OFF CACHE BOOL "" FORCE)
+    set(MAGNUM_WITH_SHADERS ON CACHE BOOL "" FORCE)
+    set(MAGNUM_WITH_SHADERTOOLS OFF CACHE BOOL "" FORCE)
+    set(MAGNUM_WITH_TEXT OFF CACHE BOOL "" FORCE)
+    set(MAGNUM_WITH_TEXTURETOOLS OFF CACHE BOOL "" FORCE)
+    set(MAGNUM_WITH_TRADE OFF CACHE BOOL "" FORCE)
+    set(MAGNUM_WITH_VK OFF CACHE BOOL "" FORCE)
+    set(MAGNUM_WITH_SDL2APPLICATION ON CACHE BOOL "" FORCE)
+    add_subdirectory(third-party/magnum EXCLUDE_FROM_ALL)
 
-set(VERBOSE OFF CACHE BOOL "" FORCE)
-set(BUILD_TEST_APP OFF CACHE BOOL "" FORCE)
-set(EFSW_INSTALL OFF CACHE BOOL "" FORCE)
-add_subdirectory(third-party/efsw EXCLUDE_FROM_ALL)
+    set(IMGUI_DIR ${CMAKE_CURRENT_SOURCE_DIR}/third-party/imgui)
+    set(MAGNUM_WITH_IMGUI ON CACHE BOOL "" FORCE)
+    add_subdirectory(third-party/magnum-integration EXCLUDE_FROM_ALL)
 
-set(BUILD_TESTING OFF CACHE BOOL "" FORCE)
-set(BUILD_CURL_EXE OFF CACHE BOOL "" FORCE)
-set(ENABLE_UNICODE ON CACHE BOOL "" FORCE)
-set(ENABLE_INET_PTON OFF CACHE BOOL "" FORCE)
-set(ENABLE_DEBUG OFF CACHE BOOL "" FORCE)
-set(ENABLE_THREADED_RESOLVER OFF CACHE BOOL "" FORCE)
-set(HTTP_ONLY ON CACHE BOOL "" FORCE)
-set(USE_LIBIDN2 OFF CACHE BOOL "" FORCE)
-set(USE_WIN32_IDN ON CACHE BOOL "" FORCE)
-set(CURL_USE_LIBPSL OFF CACHE BOOL "" FORCE)
-set(CURL_STATIC_CRT OFF CACHE BOOL "" FORCE)
-set(CURL_USE_SCHANNEL ON CACHE BOOL "" FORCE)
-set(CURL_USE_LIBSSH2 OFF CACHE BOOL "" FORCE) # For some reason, even when HTTP_ONLY is set to ON, libcurl will try to link to libssh2.
-add_subdirectory(third-party/curl EXCLUDE_FROM_ALL)
+    set(ENABLE_COMMONCRYPTO OFF CACHE BOOL "" FORCE)
+    set(ENABLE_GNUTLS OFF CACHE BOOL "" FORCE)
+    set(ENABLE_MBEDTLS OFF CACHE BOOL "" FORCE)
+    set(ENABLE_OPENSSL OFF CACHE BOOL "" FORCE)
+    set(ENABLE_WINDOWS_CRYPTO OFF CACHE BOOL "" FORCE)
+    set(ENABLE_BZIP2 OFF CACHE BOOL "" FORCE)
+    set(ENABLE_LZMA OFF CACHE BOOL "" FORCE)
+    set(ENABLE_ZSTD OFF CACHE BOOL "" FORCE)
+    set(BUILD_TOOLS OFF CACHE BOOL "" FORCE)
+    set(BUILD_REGRESS OFF CACHE BOOL "" FORCE)
+    set(BUILD_EXAMPLES OFF CACHE BOOL "" FORCE)
+    set(BUILD_DOC OFF CACHE BOOL "" FORCE)
+    add_subdirectory(third-party/libzip EXCLUDE_FROM_ALL)
+
+    set(VERBOSE OFF CACHE BOOL "" FORCE)
+    set(BUILD_TEST_APP OFF CACHE BOOL "" FORCE)
+    set(EFSW_INSTALL OFF CACHE BOOL "" FORCE)
+    add_subdirectory(third-party/efsw EXCLUDE_FROM_ALL)
+
+    set(BUILD_CURL_EXE OFF CACHE BOOL "" FORCE)
+    set(ENABLE_UNICODE ON CACHE BOOL "" FORCE)
+    set(ENABLE_INET_PTON OFF CACHE BOOL "" FORCE)
+    set(ENABLE_DEBUG OFF CACHE BOOL "" FORCE)
+    set(ENABLE_THREADED_RESOLVER OFF CACHE BOOL "" FORCE)
+    set(HTTP_ONLY ON CACHE BOOL "" FORCE)
+    set(USE_LIBIDN2 OFF CACHE BOOL "" FORCE)
+    set(USE_WIN32_IDN ON CACHE BOOL "" FORCE)
+    set(CURL_USE_LIBPSL OFF CACHE BOOL "" FORCE)
+    set(CURL_STATIC_CRT OFF CACHE BOOL "" FORCE)
+    set(CURL_USE_SCHANNEL ON CACHE BOOL "" FORCE)
+    set(CURL_USE_LIBSSH2 OFF CACHE BOOL "" FORCE) # For some reason, even when HTTP_ONLY is set to ON, libcurl will try to link to libssh2.
+    add_subdirectory(third-party/curl EXCLUDE_FROM_ALL)
+endif(SAVETOOL_USE_SYSTEM_LIBS)
 
 add_subdirectory(src)