guix/gnu/packages/patches/libmateweather-use-TZDIR.patch

From 109fef8208188ddf4be76d6899f7d8fde5b8b3be Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=E5=AE=8B=E6=96=87=E6=AD=A6?= <iyzsong@member.fsf.org>
Date: Sat, 22 Jul 2023 14:40:31 +0800
Subject: [PATCH] Use TZDIR for ZONEINFO_DIR if the variable is set.

---
 libmateweather/mateweather-timezone.c | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/libmateweather/mateweather-timezone.c b/libmateweather/mateweather-timezone.c
index 2754728..6c858c4 100644
--- a/libmateweather/mateweather-timezone.c
+++ b/libmateweather/mateweather-timezone.c
@@ -61,7 +61,7 @@ static gboolean
 parse_tzdata (const char *tzname, time_t start, time_t end,
 	      int *offset, gboolean *has_dst, int *dst_offset)
 {
-    char *filename, *contents;
+    char *tzdir, *filename, *contents;
     gsize length;
     int timecnt, transitions_size, ttinfo_map_size;
     int initial_transition = -1, second_transition = -1;
@@ -71,7 +71,10 @@ parse_tzdata (const char *tzname, time_t start, time_t end,
     char initial_isdst, second_isdst;
     int i;
 
-    filename = g_build_filename (ZONEINFO_DIR, tzname, NULL);
+    tzdir = g_getenv("TZDIR");
+    if (tzdir == NULL)
+	tzdir = ZONEINFO_DIR;
+    filename = g_build_filename (tzdir, tzname, NULL);
     if (!g_file_get_contents (filename, &contents, &length, NULL)) {
 	g_free (filename);
 	return FALSE;
@@ -403,4 +406,3 @@ mateweather_timezone_get_dst_offset (MateWeatherTimezone *zone)
     g_return_val_if_fail (zone->has_dst, 0);
     return zone->dst_offset;
 }
-
-- 
2.41.0