diff --git a/CMakeLists.txt b/CMakeLists.txt
index 16459bf5cf..1320cd2881 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -921,6 +921,9 @@ foreach(PACKAGE ${PACKAGELIST})
 	if (${PACKAGE_VAR}_FOUND)
 		message(STATUS "${PACKAGE_VAR} FOUND")
 		set(HAVE_LIB${PACKAGE_VAR} 1)
+		if (NOT DEFINED ${PACKAGE_VAR}_INCLUDE_DIRS)
+			set(${PACKAGE_VAR}_INCLUDE_DIRS ${${PACKAGE_VAR}_INCLUDE_DIR})
+		endif()
 		include_directories(SYSTEM ${${PACKAGE_VAR}_INCLUDE_DIRS})
 		set(WS_ALL_LIBS ${WS_ALL_LIBS} ${${PACKAGE_VAR}_LIBRARIES})
 		message(STATUS "${PACKAGE} includes: ${${PACKAGE_VAR}_INCLUDE_DIRS}")