From 186976ebd6cefdfe993b5ae400a559ca33c66688 Mon Sep 17 00:00:00 2001
From: Behdad Esfahbod <behdad@behdad.org>
Date: Tue, 21 Apr 2020 22:37:56 -0700
Subject: [PATCH] [autotools] C++11 requirement is mandatory

How was this not updated?
---
 configure.ac | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/configure.ac b/configure.ac
index 1733a631a..7fd9538c2 100644
--- a/configure.ac
+++ b/configure.ac
@@ -23,7 +23,7 @@ AC_PROG_CC
 AC_PROG_CC_C99
 AM_PROG_CC_C_O
 AC_PROG_CXX
-AX_CXX_COMPILE_STDCXX(11,, optional)
+AX_CXX_COMPILE_STDCXX(11)
 AC_SYS_LARGEFILE
 PKG_PROG_PKG_CONFIG([0.20])
 AM_MISSING_PROG([RAGEL], [ragel])