diff -u include/openssl.orig/dtls1.h include/openssl/dtls1.h
--- include/openssl.orig/dtls1.h Mon Dec 7 07:58:32 2015
+++ include/openssl/dtls1.h Mon Dec 7 07:56:14 2015
@@ -60,7 +60,11 @@
#ifndef HEADER_DTLS1_H
#define HEADER_DTLS1_H
+#if defined(_WIN32)
+#include <winsock2.h>
+#else
#include <sys/time.h>
+#endif
#include <stdio.h>
#include <stdlib.h>
--- include/openssl/ossl_typ.h.orig Fri Feb 18 16:30:39 2022
+++ include/openssl/ossl_typ.h Mon Feb 21 05:39:35 2022
@@ -82,6 +82,22 @@
typedef struct ASN1_ITEM_st ASN1_ITEM;
typedef struct asn1_pctx_st ASN1_PCTX;
+#if defined(_WIN32) && defined(__WINCRYPT_H__)
+#ifndef LIBRESSL_INTERNAL
+#ifdef _MSC_VER
+#pragma message("Warning, overriding WinCrypt defines")
+#else
+#warning overriding WinCrypt defines
+#endif
+#endif
+#undef X509_NAME
+#undef X509_CERT_PAIR
+#undef X509_EXTENSIONS
+#undef OCSP_REQUEST
+#undef OCSP_RESPONSE
+#undef PKCS7_ISSUER_AND_SERIAL
+#endif
+
#ifdef BIGNUM
#undef BIGNUM
#endif
diff -u include/openssl.orig/pkcs7.h include/openssl/pkcs7.h
--- include/openssl.orig/pkcs7.h Mon Dec 7 07:58:32 2015
+++ include/openssl/pkcs7.h Mon Dec 7 07:56:14 2015
@@ -69,6 +69,18 @@
extern "C" {
#endif
+#if defined(_WIN32) && defined(__WINCRYPT_H__)
+#ifndef LIBRESSL_INTERNAL
+#ifdef _MSC_VER
+#pragma message("Warning, overriding WinCrypt defines")
+#else
+#warning overriding WinCrypt defines
+#endif
+#endif
+#undef PKCS7_ISSUER_AND_SERIAL
+#undef PKCS7_SIGNER_INFO
+#endif
+
/*
Encryption_ID DES-CBC
Digest_ID MD5
--- include/openssl/x509.h.orig Thu Aug 3 13:35:00 2023
+++ include/openssl/x509.h Thu Aug 3 13:35:18 2023
@@ -100,6 +100,19 @@
extern "C" {
#endif
+#if defined(_WIN32) && defined(__WINCRYPT_H__)
+#ifndef LIBRESSL_INTERNAL
+#ifdef _MSC_VER
+#pragma message("Warning, overriding WinCrypt defines")
+#else
+#warning overriding WinCrypt defines
+#endif
+#endif
+#undef X509_NAME
+#undef X509_CERT_PAIR
+#undef X509_EXTENSIONS
+#endif
+
#define X509_FILETYPE_PEM 1
#define X509_FILETYPE_ASN1 2
#define X509_FILETYPE_DEFAULT 3
