AC_CHECK_FUNCS(futimens utimensat)
AC_CHECK_FUNCS(fstatat mknodat readlinkat)
AC_CHECK_FUNCS(readv writev preadv pwritev)
+ AC_CHECK_FUNCS(setpgid)
AC_CHECK_SIZEOF(size_t)
AC_CHECK_TYPES([blksize_t], [AC_DEFINE(HAVE_BLKSIZE_T)], ,
[#include <sys/types.h>