Dolphin refusing to compile with SDL-2.0.4

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I'm at my wit's end here; please help me!

For whatever reason, Dolphin simply refuses to compile with SDL-2.0.4. I always get the following error message:

Code:

[ 59%] Building CXX object Source/Core/InputCommon/CMakeFiles/inputcommon.dir/ControllerInterface/ControllerInterface.cpp.o
In file included from /home/alec/dolphin-emu/Source/Core/InputCommon/ControllerInterface/ControllerInterface.cpp:24:0:
/home/alec/dolphin-emu/Source/Core/InputCommon/ControllerInterface/SDL/SDL.h:9:17: fatal error: SDL.h: No such file or directory
#include <SDL.h>
                 ^
compilation terminated.
make[2]: *** [Source/Core/InputCommon/CMakeFiles/inputcommon.dir/ControllerInterface/ControllerInterface.cpp.o] Error 1
make[1]: *** [Source/Core/InputCommon/CMakeFiles/inputcommon.dir/all] Error 2
make: *** [all] Error 2

SDL.h is in /usr/local/include/SDL2, which is apparently where it's supposed to be. I don't know why the compiler can't find it.