commit 3cb4bb6b5fb8a936cb69e2e9ea6a4e692122abb9
Author: Jakub Zakrzewski <slither.jz@gmail.com>
Date:   Tue Aug 15 13:21:33 2017 -0400

    curl-confopts.m4: fix --disable-threaded-resolver
    
    Closes https://github.com/curl/curl/issues/1784

diff --git a/m4/curl-confopts.m4 b/m4/curl-confopts.m4
index d77a884d5..6dcd0f1a6 100644
--- a/m4/curl-confopts.m4
+++ b/m4/curl-confopts.m4
@@ -37,14 +37,14 @@ AC_HELP_STRING([--enable-threaded-resolver],[Enable threaded resolver])
 AC_HELP_STRING([--disable-threaded-resolver],[Disable threaded resolver]),
   OPT_THRES=$enableval)
   case "$OPT_THRES" in
-    *)
-      dnl configure option not specified
-      want_thres="yes"
-      ;;
     no)
       dnl --disable-threaded-resolver option used
       want_thres="no"
       ;;
+    *)
+      dnl configure option not specified
+      want_thres="yes"
+      ;;
   esac
   AC_MSG_RESULT([$want_thres])
 ])