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-rw-r--r--configure.ac2
1 files changed, 1 insertions, 1 deletions
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