It's an XSI extension, not available on some supported systems.
---
 configure           |    2 ++
 libavformat/utils.c |    8 +++++++-
 2 files changed, 9 insertions(+), 1 deletions(-)

diff --git a/configure b/configure
index 02bcd09..596b603 100755
--- a/configure
+++ b/configure
@@ -1105,6 +1105,7 @@ HAVE_LIST="
     poll_h
     setrlimit
     strerror_r
+    strptime
     strtok_r
     struct_addrinfo
     struct_ipv6_mreq
@@ -2775,6 +2776,7 @@ check_func  mmap
 check_func  ${malloc_prefix}posix_memalign      && enable posix_memalign
 check_func  setrlimit
 check_func  strerror_r
+check_func  strptime
 check_func  strtok_r
 check_func_headers io.h setmode
 check_func_headers lzo/lzo1x.h lzo1x_999_compress
diff --git a/libavformat/utils.c b/libavformat/utils.c
index d989341..d00eef2 100644
--- a/libavformat/utils.c
+++ b/libavformat/utils.c
@@ -3888,7 +3888,13 @@ void ff_make_absolute_url(char *buf, int size, const 
char *base,
 
 int64_t ff_iso8601_to_unix_time(const char *datestr)
 {
+#if HAVE_STRPTIME
     struct tm time = {0};
-    strptime(t->value, "%Y - %m - %dT%T", &time);
+    strptime(datestr, "%Y - %m - %dT%T", &time);
     return mktime(&time);
+#else
+    av_log(NULL, AV_LOG_WARNING, "strptime() unavailable on this system, 
cannot convert "
+                                 "the date string.\n");
+    return 0;
+#endif
 }
-- 
1.7.5.3

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