diff -ur a/CMakeLists.txt b/CMakeLists.txt
--- a/CMakeLists.txt	2019-07-23 21:41:00.000000000 +0200
+++ b/CMakeLists.txt	2019-10-27 20:26:38.000000000 +0100
@@ -278,7 +278,7 @@
 # General includes
 include_directories(${SDL2_BINARY_DIR}/include ${SDL2_SOURCE_DIR}/include)
 if(USE_GCC OR USE_CLANG)
-  set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -idirafter ${SDL2_SOURCE_DIR}/src/video/khronos")
+  set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -idirafter \"${SDL2_SOURCE_DIR}/src/video/khronos\"")
 else()
   include_directories(${SDL2_SOURCE_DIR}/src/video/khronos)
 endif()
diff -ur a/cmake/sdlchecks.cmake b/cmake/sdlchecks.cmake
--- a/cmake/sdlchecks.cmake	2019-07-23 21:41:00.000000000 +0200
+++ b/cmake/sdlchecks.cmake	2019-10-27 20:27:10.000000000 +0100
@@ -1088,7 +1088,7 @@
       set(HAVE_SDL_JOYSTICK TRUE)
       file(GLOB HIDAPI_SOURCES ${SDL2_SOURCE_DIR}/src/joystick/hidapi/*.c)
       set(SOURCE_FILES ${SOURCE_FILES} ${HIDAPI_SOURCES})
-      set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} ${LIBUSB_CFLAGS} -I${SDL2_SOURCE_DIR}/src/hidapi/hidapi")
+      set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} ${LIBUSB_CFLAGS} \"-I${SDL2_SOURCE_DIR}/src/hidapi/hidapi\"")
       if(NOT HIDAPI_SKIP_LIBUSB)
         if(HIDAPI_ONLY_LIBUSB)
           set(SOURCE_FILES ${SOURCE_FILES} ${SDL2_SOURCE_DIR}/src/hidapi/libusb/hid.c)
