Index: sys/contrib/zstd/programs/timefn.h
===================================================================
--- sys/contrib/zstd/programs/timefn.h
+++ sys/contrib/zstd/programs/timefn.h
@@ -57,8 +57,9 @@
 
 /* C11 requires timespec_get, but FreeBSD 11 lacks it, while still claiming C11 compliance.
    Android also lacks it but does define TIME_UTC. */
-#elif (defined (__STDC_VERSION__) && (__STDC_VERSION__ >= 201112L) /* C11 */) \
-    && defined(TIME_UTC) && !defined(__ANDROID__)
+#elif defined(FORCE_C11_TIMERS) || \
+    ((defined (__STDC_VERSION__) && (__STDC_VERSION__ >= 201112L) /* C11 */) \
+    && defined(TIME_UTC) && !defined(__ANDROID__))
 
     typedef struct timespec UTIL_time_t;
     #define UTIL_TIME_INITIALIZER { 0, 0 }
Index: sys/contrib/zstd/programs/timefn.c
===================================================================
--- sys/contrib/zstd/programs/timefn.c
+++ sys/contrib/zstd/programs/timefn.c
@@ -84,8 +84,9 @@
 
 /* C11 requires timespec_get, but FreeBSD 11 lacks it, while still claiming C11 compliance.
    Android also lacks it but does define TIME_UTC. */
-#elif (defined (__STDC_VERSION__) && (__STDC_VERSION__ >= 201112L) /* C11 */) \
-    && defined(TIME_UTC) && !defined(__ANDROID__)
+#elif defined(FORCE_C11_TIMERS) || \
+    ((defined (__STDC_VERSION__) && (__STDC_VERSION__ >= 201112L) /* C11 */) \
+    && defined(TIME_UTC) && !defined(__ANDROID__))
 
 #include <stdlib.h>   /* abort */
 #include <stdio.h>    /* perror */
Index: usr.bin/zstd/Makefile
===================================================================
--- usr.bin/zstd/Makefile
+++ usr.bin/zstd/Makefile
@@ -18,7 +18,8 @@
 		-I${SRCTOP}/sys/contrib/zstd/lib \
 		-DXXH_NAMESPACE=ZSTD_ \
 		-DHAVE_THREAD=1 \
-		-DZSTD_MULTITHREAD=1
+		-DZSTD_MULTITHREAD=1 \
+		-DFORCE_C11_TIMERS=1
 LINKS=	${BINDIR}/zstd ${BINDIR}/unzstd \
 	${BINDIR}/zstd ${BINDIR}/zstdcat \
 	${BINDIR}/zstd ${BINDIR}/zstdmt