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-rw-r--r--src/timezone/difftime.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/src/timezone/difftime.c b/src/timezone/difftime.c
index a4aa631d15a..636640d6f57 100644
--- a/src/timezone/difftime.c
+++ b/src/timezone/difftime.c
@@ -1,3 +1,4 @@
+#include "pgtz.h"
/*
** This file is in the public domain, so clarified as of
** June 5, 1996 by Arthur David Olson (arthur_david_olson@nih.gov).