diff -ru3 SDL2-2.0.4/sdl2-config.cmake.in SDL2-2.0.4-new/sdl2-config.cmake.in
--- SDL2-2.0.4/sdl2-config.cmake.in	2016-01-02 22:56:31.000000000 +0300
+++ SDL2-2.0.4-new/sdl2-config.cmake.in	2016-08-22 05:26:42.420397323 +0300
@@ -6,5 +6,6 @@
 set(SDL2_PREFIX "@prefix@")
 set(SDL2_EXEC_PREFIX "@prefix@")
 set(SDL2_LIBDIR "@libdir@")
-set(SDL2_INCLUDE_DIRS "@includedir@/SDL2")
+set(SDL2_INCLUDE_DIRS "@includedir@/SDL2" $ENV{SDL2_PATH})
+separate_arguments(SDL2_INCLUDE_DIRS)
 set(SDL2_LIBRARIES "-L${SDL2_LIBDIR} @SDL_RLD_FLAGS@ @SDL_LIBS@")
diff -ru3 SDL2-2.0.4/sdl2-config.in SDL2-2.0.4-new/sdl2-config.in
--- SDL2-2.0.4/sdl2-config.in	2016-01-02 22:56:31.000000000 +0300
+++ SDL2-2.0.4-new/sdl2-config.in	2016-08-22 05:32:02.256397839 +0300
@@ -42,7 +42,11 @@
       echo @SDL_VERSION@
       ;;
     --cflags)
-      echo -I@includedir@/SDL2 @SDL_CFLAGS@
+      SDL_CFLAGS=""
+      for i in @includedir@/SDL2 $SDL2_PATH; do
+        SDL_CFLAGS="$SDL_CFLAGS -I$i"
+      done
+      echo $SDL_CFLAGS @SDL_CFLAGS@
       ;;
 @ENABLE_SHARED_TRUE@    --libs)
 @ENABLE_SHARED_TRUE@      echo -L@libdir@ @SDL_RLD_FLAGS@ @SDL_LIBS@