diff --git a/source/shared_lib/CMakeLists.txt b/source/shared_lib/CMakeLists.txt
index e5a06fc44..c031510ce 100644
--- a/source/shared_lib/CMakeLists.txt
+++ b/source/shared_lib/CMakeLists.txt
@@ -95,10 +95,11 @@ IF(BUILD_MEGAGLEST_MODEL_VIEWER OR BUILD_MEGAGLEST_MAP_EDITOR OR BUILD_MEGAGLEST
 		SET(EXTERNAL_LIBS ${EXTERNAL_LIBS} ${OPENGL_LIBRARY})
 	ENDIF()
 
-        IF(UNIX)
-		FIND_PACKAGE(X11 REQUIRED)
+	FIND_PACKAGE(X11 REQUIRED)
+	INCLUDE_DIRECTORIES(${X11_INCLUDE_DIR})
+	IF(UNIX)
 		SET(EXTERNAL_LIBS ${EXTERNAL_LIBS} ${X11_LIBRARIES})
-        ENDIF()
+	ENDIF()
 
         IF(WANT_XERCES)
 	        FIND_PACKAGE(XercesC REQUIRED)