commit f262b3586cb40f6fdb265188456cfb0ff4e4ed2a
author Jeremy Tan <jtanx@outlook.com> Mon Jul 31 21:24:38 2017 +1000
committer Daniel Stenberg <daniel@haxx.se> Tue Aug 01 01:04:45 2017 +0200
tree 06bd6f4818343f68c6cdb3c6a4c014072ea39688
parent 909283ae5a057487265ce9d8b684cf01451d096a

configure: fix the check for IdnToUnicode

Fixes #1669
Closes #1713

configure.ac

diff --git a/configure.ac b/configure.ac
index 5104c9e..edcb393 100644
--- a/configure.ac
+++ b/configure.ac
@@ -2782,6 +2782,7 @@
   clean_LDFLAGS="$LDFLAGS"
   clean_LIBS="$LIBS"
   WINIDN_LIBS="-lnormaliz"
+  WINIDN_CPPFLAGS="-DWINVER=0x0600"
   #
   if test "$want_winidn_path" != "default"; then
     dnl path has been specified
@@ -2797,7 +2798,11 @@
   #
   AC_MSG_CHECKING([if IdnToUnicode can be linked])
   AC_LINK_IFELSE([
-    AC_LANG_FUNC_LINK_TRY([IdnToUnicode])
+    AC_LANG_PROGRAM([[
+      #include <windows.h>
+    ]],[[
+      IdnToUnicode(0, NULL, 0, NULL, 0);
+    ]])
   ],[
     AC_MSG_RESULT([yes])
     tst_links_winidn="yes"