-add_executable(surf_usage ${CMAKE_HOME_DIRECTORY}/teshsuite/surf/surf_usage/surf_usage.c)
-add_executable(surf_usage2 ${CMAKE_HOME_DIRECTORY}/teshsuite/surf/surf_usage/surf_usage2.c)
+add_executable(surf_usage ${CMAKE_HOME_DIRECTORY}/teshsuite/surf/surf_usage/surf_usage.cpp)
+add_executable(surf_usage2 ${CMAKE_HOME_DIRECTORY}/teshsuite/surf/surf_usage/surf_usage2.cpp)