diff -r 227718170097 -r ae6706411b24 cmake_modules/FindSDL2_mixer.cmake
--- a/cmake_modules/FindSDL2_mixer.cmake	Thu Apr 21 00:09:07 2016 -0400
+++ b/cmake_modules/FindSDL2_mixer.cmake	Thu Apr 21 00:10:23 2016 -0400
@@ -74,6 +74,12 @@
 set(SDL2_MIXER_LIBRARIES ${SDL2_MIXER_LIBRARY})
 set(SDL2_MIXER_INCLUDE_DIRS ${SDL2_MIXER_INCLUDE_DIR})
 
+if(BUILD_ENGINE_JS)
+    set(SDL2_MIXER_LIBRARY "sdl2_mixer_emscripten_internal")
+    set(SDL2_MIXER_LIBRARIES "sdl2_mixer_emscripten_internal")
+    set(SDL2_MIXER_INCLUDE_DIRS "${CMAKE_SYSTEM_INCLUDE_PATH}/SDL")
+endif()
+
 include(FindPackageHandleStandardArgs)
 
 FIND_PACKAGE_HANDLE_STANDARD_ARGS(SDL2_mixer