# backtrace could be in libexecinfo or in libc
-conf.CHECK_FUNCS_IN('backtrace', 'execinfo', checklibc=True, headers='execinfo.h')
+conf.CHECK_FUNCS_IN('backtrace backtrace_symbols', 'execinfo', checklibc=True, headers='execinfo.h')
conf.CHECK_FUNCS('sigprocmask sigblock sigaction')
conf.CHECK_FUNCS('''
_acl __acl add_proplist_entry atexit attr_getf attr_list attr_listf
-attropen attr_remove attr_removef attr_set attr_setf backtrace_symbols
+attropen attr_remove attr_removef attr_set attr_setf
bindtextdomain _chdir __chdir chflags chmod _close __close _closedir
__closedir closedir64 creat64 crypt16 delproplist devnm dgettext dirfd
DNSServiceRegister _dup __dup _dup2 __dup2 endmntent execl