--- tz-masterold/private.h	2019-11-30 10:07:16.860120000 -0500
+++ tz-masternew/private.h	2019-11-30 10:12:23.464122000 -0500
@@ -132,11 +132,17 @@
 ** Nested includes
 */
 
-/* Avoid clashes with NetBSD by renaming NetBSD's declarations.  */
+/*
+ * Avoid clashes with NetBSD by renaming NetBSD's declarations.
+ * Also, when providing timezone for USG_COMPAT, avoid clashes with the Unix v7 timezone(3) function, which is still available on FreeBSD.
+ */
 #define localtime_rz sys_localtime_rz
 #define mktime_z sys_mktime_z
 #define posix2time_z sys_posix2time_z
 #define time2posix_z sys_time2posix_z
+#if 2 <= USG_COMPAT + (TZ_TIME_T || !HAVE_POSIX_DECLS)
+# define timezone sys_timezone
+#endif
 #define timezone_t sys_timezone_t
 #define tzalloc sys_tzalloc
 #define tzfree sys_tzfree
@@ -145,6 +151,9 @@
 #undef mktime_z
 #undef posix2time_z
 #undef time2posix_z
+#if 2 <= USG_COMPAT + (TZ_TIME_T || !HAVE_POSIX_DECLS)
+# undef timezone
+#endif
 #undef timezone_t
 #undef tzalloc
 #undef tzfree