Index: build/premake/premake5.lua
===================================================================
--- build/premake/premake5.lua
+++ build/premake/premake5.lua
@@ -730,7 +730,8 @@
 		"graphics/scripting",
 		"renderer",
 		"renderer/scripting",
-		"third_party/mikktspace"
+		"third_party/mikktspace",
+		"third_party/ogre3d"
 	}
 	extern_libs = {
 		"opengl",
@@ -745,6 +746,7 @@
 
 
 	source_dirs = {
+		"third_party/ogre3d",
 		"tools/atlas/GameInterface",
 		"tools/atlas/GameInterface/Handlers"
 	}
Index: source/ps/PreprocessorWrapper.h
===================================================================
--- source/ps/PreprocessorWrapper.h
+++ source/ps/PreprocessorWrapper.h
@@ -18,7 +18,7 @@
 #ifndef INCLUDED_PREPROCESSORWRAPPER
 #define INCLUDED_PREPROCESSORWRAPPER
 
-#include "ps/Preprocessor.h"
+#include "third_party/ogre3d/OgreGLSLPreprocessor.h"
 #include "ps/CStr.h"
 
 class CShaderDefines;
Index: source/ps/tests/test_Preprocessor.h
===================================================================
--- source/ps/tests/test_Preprocessor.h
+++ source/ps/tests/test_Preprocessor.h
@@ -17,7 +17,7 @@
 
 #include "lib/self_test.h"
 
-#include "ps/Preprocessor.h"
+#include "third_party/ogre3d/OgreGLSLPreprocessor.h"
 
 class TestPreprocessor : public CxxTest::TestSuite
 {
Index: source/third_party/ogre3d/OgreGLSLPreprocessor.cpp
===================================================================
--- source/third_party/ogre3d/OgreGLSLPreprocessor.cpp
+++ source/third_party/ogre3d/OgreGLSLPreprocessor.cpp
@@ -34,7 +34,7 @@
 
 #include "precompiled.h"
 
-#include "Preprocessor.h"
+#include "OgreGLSLPreprocessor.h"
 
 #include "ps/CLogger.h"