From b8a3b44d3daf88a9e02fd443e8b9c0aa56e800b2 Mon Sep 17 00:00:00 2001
From: Patrick McDermott <patrick.mcdermott@libiquity.com>
Date: Mon, 03 Sep 2018 13:58:38 -0400
Subject: configure.ac: Improve date %s support check

---
diff --git a/configure.ac b/configure.ac
index d1f9182..b0c026b 100644
--- a/configure.ac
+++ b/configure.ac
@@ -192,7 +192,7 @@ AC_ARG_WITH(
 	]
 )
 dnl Ugh, quadrigraphs.
-case "$(date '+%s' 2>/dev/null)" in *@<:@!0-9@:>@*)
+case "$(date '+%s' 2>/dev/null)" in *@<:@!0-9@:>@*|'')
 	AC_MSG_ERROR([${DATE} doesn't support the `%s' format sequence])
 esac
 
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