diff --git a/rdtk/CMakeLists.txt b/rdtk/CMakeLists.txt
index 35b005212..063f19576 100644
--- a/rdtk/CMakeLists.txt
+++ b/rdtk/CMakeLists.txt
@@ -66,8 +66,10 @@ include_directories(${CMAKE_CURRENT_BINARY_DIR}/include)
 add_subdirectory(include)
 add_subdirectory(librdtk)
 
-if(WITH_X11)
-	add_subdirectory(sample)
+if(WITH_SAMPLE)
+	if(WITH_X11)
+		add_subdirectory(sample)
+	endif()
 endif()
 
 # Exporting