From d88ad0e0d9817219332b44ebf2749af6ef4a8e7a Mon Sep 17 00:00:00 2001
From: Ward Fisher <wfisher@ucar.edu>
Date: Mon, 23 May 2016 15:31:40 -0600
Subject: [PATCH] Corrected an issue with autoconf config date using
 source_date_epoch even when SOURCE_DATE_EPOCH was not defined.

---
 configure.ac | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/configure.ac b/configure.ac
index 75e7cadf1..f995e9724 100644
--- a/configure.ac
+++ b/configure.ac
@@ -45,7 +45,7 @@ AC_MSG_NOTICE([netCDF AC_PACKAGE_VERSION])
 AC_CONFIG_MACRO_DIR([m4])
 
 # Configuration Date
-if test -n ${SOURCE_DATE_EPOCH}; then
+if test "x$SOURCE_DATE_EPOCH" != "x" ; then
     AC_SUBST([CONFIG_DATE]) CONFIG_DATE="`date -u -d "${SOURCE_DATE_EPOCH}"`"
 else
     AC_SUBST([CONFIG_DATE]) CONFIG_DATE="`date`"