-add_executable(ping_simulator _ping_simulator.c ping_server.c ping_client.c ping_common.c)
-add_executable(ping_client _ping_client.c ping_client.c ping_common.c)
-add_executable(ping_server _ping_server.c ping_server.c ping_common.c)
+add_executable(ping_simulator ${PROJECT_DIRECTORY}/examples/gras/ping/_ping_simulator.c ping_server.c ${PROJECT_DIRECTORY}/examples/gras/ping/ping_client.c ${PROJECT_DIRECTORY}/examples/gras/ping/ping_common.c)
+add_executable(ping_client ${PROJECT_DIRECTORY}/examples/gras/ping/_ping_client.c ${PROJECT_DIRECTORY}/examples/gras/ping/ping_client.c ping_common.c)
+add_executable(ping_server ${PROJECT_DIRECTORY}/examples/gras/ping/_ping_server.c ${PROJECT_DIRECTORY}/examples/gras/ping/ping_server.c ping_common.c)