+AC_CHECK_DECLS([sys_siglist], [], [], [[#include <signal.h>]])
+AC_CHECK_MEMBERS([struct stat.st_mtim.tv_nsec, struct stat.st_mtimensec],
+ [], [], [[#include <sys/stat.h>]])
+AC_CHECK_MEMBERS([struct ifreq.ifr_flagshigh], [], [], [[#include <net/if.h>]])
+AC_CHECK_FUNCS([mlockall strnlen getloadavg statvfs getmntent_r])
+AC_CHECK_HEADERS([mntent.h sys/statvfs.h linux/types.h linux/if_ether.h stdatomic.h])
+AC_CHECK_HEADERS([net/if_mib.h], [], [], [[#include <sys/types.h>
+#include <net/if.h>]])