diff --git a/CMakeLists.txt b/CMakeLists.txt
index b0fa7bdbbd..0dc61dfc5e 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -26,6 +26,10 @@ macro_log_feature(KWIN_HAVE_COMPOSITING "Compositing support" "X11 Compositing s
 
 macro_bool_to_01( OPENGL_FOUND KWIN_HAVE_OPENGL )
 
+if(OPENGL_FOUND)
+  include_directories(${OPENGL_INCLUDE_DIR})
+endif(OPENGL_FOUND)
+
 # for things that are also used by kwin libraries
 configure_file(lib/kwinconfig.h.cmake ${CMAKE_CURRENT_BINARY_DIR}/lib/kwinconfig.h )
 # for kwin internal things
diff --git a/lib/CMakeLists.txt b/lib/CMakeLists.txt
index 420c96bb45..f38bf80b8b 100644
--- a/lib/CMakeLists.txt
+++ b/lib/CMakeLists.txt
@@ -8,7 +8,6 @@ set(kdecorations_LIB_SRCS
    kcommondecoration.cpp
    kcommondecoration_p.cpp )
 
-
 kde4_add_library(kdecorations SHARED ${kdecorations_LIB_SRCS})
 
 target_link_libraries(kdecorations ${KDE4_KDEUI_LIBS} kephal)
@@ -54,6 +53,7 @@ if(OPENGL_FOUND)
   if (DL_LIBRARY)
     target_link_libraries(kwineffects ${DL_LIBRARY})
   endif(DL_LIBRARY)
+  include_directories(${OPENGL_INCLUDE_DIR})
 endif(OPENGL_FOUND)
 if (X11_Xrender_FOUND)
   target_link_libraries(kwineffects ${X11_Xrender_LIB})