set (CMAKE_REQUIRED_DEFINITIONS ${CMAKE_REQUIRED_DEFINITIONS} -D_GNU_SOURCE)
check_symbol_exists (dl_iterate_phdr link.h HAVE_DL_ITERATE_PHDR)
set (CMAKE_REQUIRED_DEFINITIONS ${CMAKE_REQUIRED_DEFINITIONS} -D_GNU_SOURCE)
check_symbol_exists (dl_iterate_phdr link.h HAVE_DL_ITERATE_PHDR)