From 7af5f70139d85cae773a4cd58b0708363bf44f9a Mon Sep 17 00:00:00 2001
From: Eelco Dolstra <edolstra@gmail.com>
Date: Thu, 10 Jan 2019 10:10:20 +0100
Subject: [PATCH] Revert "Escape square brackets in configure.ac"

This reverts commit 80f464d9d72839841422f75e78ce725365cc3d71.
---
 configure.ac | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/configure.ac b/configure.ac
index 55600d90..4f00ff01 100644
--- a/configure.ac
+++ b/configure.ac
@@ -275,7 +275,7 @@ test "$prefix" = NONE && prefix=$ac_default_prefix
 test "$exec_prefix" = NONE && exec_prefix='${prefix}'
 for name in $ac_subst_vars; do
     for _ in 1 2 3; do
-    if printf '%s' "${name}" | egrep '^[[_[[:alpha:]]]][[_[[:alnum:]]]]*$'
+    if printf '%s' "${name}" | egrep '^[_[:alpha:]][_[:alnum:]]*$'
     then
         eval "${name}"="$(eval echo "\${${name}}")"
     fi