diff --git a/CMakeLists.txt b/CMakeLists.txt
index 01d32ed..f61bec9 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -4,6 +4,9 @@ set(CMAKE_OSX_DEPLOYMENT_TARGET "11.0")
 project(parallel-rdp LANGUAGES CXX C)
 
 set(NAME_PLUGIN_SIMPLE64 "simple64-video-parallel")
+if(DEFINED APIDIR)
+    include_directories("${APIDIR}")
+endif()
 include_directories(../mupen64plus-core/src/api)
 add_definitions(-DM64P_PLUGIN_API)