diff -aruN nspr-4.8.6/mozilla/nsprpub/pr/include/prtime.h nspr-4.8.6.N/mozilla/nsprpub/pr/include/prtime.h
--- nspr-4.8.6/mozilla/nsprpub/pr/include/prtime.h	2016-01-21 12:46:01.000000000 -0800
+++ nspr-4.8.6.N/mozilla/nsprpub/pr/include/prtime.h	2016-01-21 12:44:49.000000000 -0800
@@ -50,6 +50,9 @@
 
 #include "prlong.h"
 
+#define HAVE_POINTER_LOCALTIME_R 1
+#define HAVE_LOCALTIME_R 1
+
 PR_BEGIN_EXTERN_C
 
 /**********************************************************************/
diff -aruN nspr-4.8.6/mozilla/nsprpub/pr/src/misc/prtime.c nspr-4.8.6.N/mozilla/nsprpub/pr/src/misc/prtime.c
--- nspr-4.8.6/mozilla/nsprpub/pr/src/misc/prtime.c	2016-01-21 12:46:01.000000000 -0800
+++ nspr-4.8.6.N/mozilla/nsprpub/pr/src/misc/prtime.c	2016-01-21 12:45:04.000000000 -0800
@@ -823,6 +823,9 @@
      *    since Jan. 2, 1970.
      */
 
+    /* Run tzset() to guarantee that we are using up-to-date time parameters. */
+    tzset();
+
     secs = 86400L;
     (void) MT_safe_localtime(&secs, &localTime);