From 0869c13c58986d5a8f45f9d22f2694f41e726bc9 Mon Sep 17 00:00:00 2001
From: "J. Peter Mugaas" <jpmugaas@suddenlink.net>
Date: Mon, 12 Dec 2016 08:32:01 -0500
Subject: [PATCH] Changes to configure.ac from MSYS2 Pacman project for
 mingw-w64.  This allows you to use Bcrypt for CNG with autotools.

---
 configure.ac | 14 +++++++++++++-
 1 file changed, 13 insertions(+), 1 deletion(-)

diff --git a/configure.ac b/configure.ac
index ffefa6c51..c35adc129 100644
--- a/configure.ac
+++ b/configure.ac
@@ -279,7 +279,6 @@ AC_CHECK_HEADERS([sys/param.h sys/poll.h sys/select.h sys/statfs.h sys/statvfs.h
 AC_CHECK_HEADERS([sys/time.h sys/utime.h sys/utsname.h sys/vfs.h])
 AC_CHECK_HEADERS([time.h unistd.h utime.h wchar.h wctype.h])
 AC_CHECK_HEADERS([windows.h])
-AC_CHECK_HEADERS([Bcrypt.h])
 # check windows.h first; the other headers require it.
 AC_CHECK_HEADERS([wincrypt.h winioctl.h],[],[],
 [[#ifdef HAVE_WINDOWS_H
@@ -386,6 +385,9 @@ if test "x$with_lzo2" != "xno"; then
   AC_CHECK_LIB(lzo2,lzo1x_decompress_safe)
 fi
 
+AC_ARG_WITH([cng],
+  AS_HELP_STRING([--without-cng], [Don't build support of CNG(Crypto Next Generation)]))
+
 AC_ARG_WITH([nettle],
   AS_HELP_STRING([--without-nettle], [Don't build with crypto support from Nettle]))
 AC_ARG_WITH([openssl],
@@ -820,6 +822,16 @@ case "$host_os" in
 	;;
 esac
 
+if test "x$with_cng" != "xno"; then
+    AC_CHECK_HEADERS([bcrypt.h],[
+        LIBS="$LIBS -lbcrypt"
+    ],[],
+    [[#ifdef HAVE_WINDOWS_H
+    # include <windows.h>
+    #endif
+    ]])
+fi
+
 if test "x$with_nettle" != "xno"; then
     AC_CHECK_HEADERS([nettle/md5.h nettle/ripemd160.h nettle/sha.h])
     AC_CHECK_HEADERS([nettle/pbkdf2.h nettle/aes.h nettle/hmac.h])
-- 
2.47.2