diff --git a/CMakeLists.txt b/CMakeLists.txt
index 6e356fbec..cb1156a2d 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -283,6 +283,7 @@ include_directories(${OPENSCENEGRAPH_INCLUDE_DIRS}
 	${Boost_INCLUDE_DIRS}
 	${ZLIB_INCLUDE_DIR}
 	${ALUT_INCLUDE_DIR}
+	${OPENGL_INCLUDE_DIR}
 	${OPENAL_INCLUDE_DIR}
 	${SIMGEAR_INCLUDE_DIR}
 	${PLIB_INCLUDE_DIR} )
diff --git a/utils/fgpanel/CMakeLists.txt b/utils/fgpanel/CMakeLists.txt
index c90b770d6..d6f4b4351 100644
--- a/utils/fgpanel/CMakeLists.txt
+++ b/utils/fgpanel/CMakeLists.txt
@@ -34,6 +34,8 @@ if(GLUT_FOUND)
 		${SIMGEAR_CORE_LIBRARY_DEPENDENCIES}
 	)
 
+	include_directories(${PNG_INCLUDE_DIR})
+
 	install(TARGETS fgpanel RUNTIME DESTINATION bin)
 else()
 	message(STATUS "glut NOT found, can't build fgpanel")