cmake HAS_LIBRT_4SURE examples

ElektraInitiative/libelektra scripts/cmake/Modules/FindLibRt.cmake :21

try_compile (HAS_LIBRT_4SURE "${CMAKE_BINARY_DIR}" "${PROJECT_SOURCE_DIR}/tests/librt_test.c")

ElektraInitiative/libelektra scripts/cmake/Modules/FindLibRt.cmake :28

unset (HAS_LIBRT_4SURE)