diff -aruN zstd-1.4.5.orig/programs/util.c zstd-1.4.5/programs/util.c
--- zstd-1.4.5.orig/programs/util.c	2020-05-22 14:04:00.000000000 +0900
+++ zstd-1.4.5/programs/util.c	2020-11-25 21:49:30.025076139 +0900
@@ -28,7 +28,7 @@
 #  include <io.h>         /* _chmod */
 #else
 #  include <unistd.h>     /* chown, stat */
-#  if PLATFORM_POSIX_VERSION < 200809L
+#  if PLATFORM_POSIX_VERSION < 200809L || !defined(st_mtime)
 #    include <utime.h>    /* utime */
 #  else
 #    include <fcntl.h>    /* AT_FDCWD */