-design_SOURCES=design.h design_main.cpp
-
-test_filter1_SOURCES=test_filter1.cpp
-test_filter2_SOURCES=test_filter2.cpp
-test_session1_SOURCES=test_session1.cpp
+test_filter1_SOURCES=test_filter1.cpp $(YP2_INCHPP)
+test_filter2_SOURCES=test_filter2.cpp $(YP2_INCHPP)
+test_session1_SOURCES=test_session1.cpp $(YP2_INCHPP)