From c3700819a6e23b41e43c6f1e8992d8a44d32075b Mon Sep 17 00:00:00 2001
From: Jan Beich <jbeich@FreeBSD.org>
Date: Fri, 23 Jun 2023 19:25:20 +0000
Subject: [PATCH] cmake: use date -r on more BSDs

- macOS `date` is based on FreeBSD while `-r` is from historical BSD
- GNU `date` may not be installed or installed as `gdate`
---
 src/tzdb/CMakeLists.txt | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/tzdb/CMakeLists.txt b/src/tzdb/CMakeLists.txt
index e7c8053..33eb928 100644
--- a/src/tzdb/CMakeLists.txt
+++ b/src/tzdb/CMakeLists.txt
@@ -24,7 +24,7 @@ execute_process(
 
 string(REPLACE "\n" "" TZ_COMMIT_TIME "${TZ_COMMIT_TIME}")
 
-if (APPLE)
+if (APPLE OR CMAKE_SYSTEM_NAME MATCHES "DragonFly|FreeBSD|NetBSD|OpenBSD")
 	set(VERSION_COMMAND ${GNU_DATE} -r ${TZ_COMMIT_TIME} +%y%m%d) 
 else ()
 	set(VERSION_COMMAND ${GNU_DATE} +%y%m%d --date=@${TZ_COMMIT_TIME})