SET(EXTRA_CFLAGS "${EXTRA_CFLAGS} -Wall -Werror -fvisibility=hidden")
SET(EXTRA_CXXFLAGS "${EXTRA_CXXFLAGS} -Wall -Werror -fvisibility=hidden -fvisibility-inlines-hidden")
-SET(CMAKE_C_FLAGS "-I${CMAKE_SOURCE_DIR} -I${CMAKE_SOURCE_DIR}/include ${CMAKE_C_FLAGS} ${EXTRA_CFLAGS} -fPIE")
+SET(CMAKE_C_FLAGS "-I${CMAKE_SOURCE_DIR} -I${CMAKE_SOURCE_DIR}/include ${CMAKE_C_FLAGS} ${EXTRA_CFLAGS} -fPIE -D_GNU_SOURCE")
SET(CMAKE_C_FLAGS_DEBUG "-O0 -g -fPIE")
SET(CMAKE_C_FLAGS_RELEASE "-O2 -fPIE")