From 3957bb4ebef3e76411d15d0559cdd28aa503a63e Mon Sep 17 00:00:00 2001
From: John Safranek <john@wolfssl.com>
Date: Fri, 20 Jul 2018 15:14:03 -0700
Subject: [PATCH] Configure Fix 1. The check for options that start with an
 underscore to wrap them with another check was broken. Replaced with a use of
 grep. The old original version breaks on some shells.

---
 configure.ac | 7 +++----
 1 file changed, 3 insertions(+), 4 deletions(-)

diff --git a/configure.ac b/configure.ac
index 19c74590d..f149bf60e 100644
--- a/configure.ac
+++ b/configure.ac
@@ -4319,10 +4319,9 @@ for option in $OPTION_FLAGS; do
         fi
 
         # allow user to ignore system options
-        ignoresys=no
-        if test "$noequalsign = _*"
+        ignoresys=$(echo "$noequalsign" | grep '^_.*')
+        if test -n "$ignoresys"
         then
-            ignoresys=yes
             echo "#ifndef WOLFSSL_OPTIONS_IGNORE_SYS" >> $OPTION_FILE
         fi
 
@@ -4330,7 +4329,7 @@ for option in $OPTION_FLAGS; do
         echo "#undef  $noarg" >> $OPTION_FILE
         echo "#define $noequalsign" >> $OPTION_FILE
 
-        if test "$ignoresys" = "yes"
+        if test -n "$ignoresys"
         then
             echo "#endif" >> $OPTION_FILE
         fi