diff --git a/squid-5.2-openssl3.patch b/squid-5.2-openssl3.patch
new file mode 100644
index 0000000..32ff6ee
--- /dev/null
+++ b/squid-5.2-openssl3.patch
@@ -0,0 +1,185 @@
+diff --git a/src/ssl/support.cc b/src/ssl/support.cc
+index 3ad135d..73912ce 100644
+--- a/src/ssl/support.cc
++++ b/src/ssl/support.cc
+@@ -557,7 +557,11 @@ Ssl::VerifyCallbackParameters::At(Security::Connection &sconn)
+ }
+ 
+ // "dup" function for SSL_get_ex_new_index("cert_err_check")
+-#if SQUID_USE_CONST_CRYPTO_EX_DATA_DUP
++#if OPENSSL_VERSION_MAJOR >= 3
++static int
++ssl_dupAclChecklist(CRYPTO_EX_DATA *, const CRYPTO_EX_DATA *, void **,
++                    int, long, void *)
++#elif SQUID_USE_CONST_CRYPTO_EX_DATA_DUP
+ static int
+ ssl_dupAclChecklist(CRYPTO_EX_DATA *, const CRYPTO_EX_DATA *, void *,
+                     int, long, void *)
+diff --git a/src/security/PeerOptions.cc b/src/security/PeerOptions.cc
+index cf1d4ba..4346ba5 100644
+--- a/src/security/PeerOptions.cc
++++ b/src/security/PeerOptions.cc
+@@ -297,130 +297,130 @@ static struct ssl_option {
+ 
+ } ssl_options[] = {
+ 
+-#if SSL_OP_NETSCAPE_REUSE_CIPHER_CHANGE_BUG
++#ifdef SSL_OP_NETSCAPE_REUSE_CIPHER_CHANGE_BUG
+     {
+         "NETSCAPE_REUSE_CIPHER_CHANGE_BUG", SSL_OP_NETSCAPE_REUSE_CIPHER_CHANGE_BUG
+     },
+ #endif
+-#if SSL_OP_SSLREF2_REUSE_CERT_TYPE_BUG
++#ifdef SSL_OP_SSLREF2_REUSE_CERT_TYPE_BUG
+     {
+         "SSLREF2_REUSE_CERT_TYPE_BUG", SSL_OP_SSLREF2_REUSE_CERT_TYPE_BUG
+     },
+ #endif
+-#if SSL_OP_MICROSOFT_BIG_SSLV3_BUFFER
++#ifdef SSL_OP_MICROSOFT_BIG_SSLV3_BUFFER
+     {
+         "MICROSOFT_BIG_SSLV3_BUFFER", SSL_OP_MICROSOFT_BIG_SSLV3_BUFFER
+     },
+ #endif
+-#if SSL_OP_SSLEAY_080_CLIENT_DH_BUG
++#ifdef SSL_OP_SSLEAY_080_CLIENT_DH_BUG
+     {
+         "SSLEAY_080_CLIENT_DH_BUG", SSL_OP_SSLEAY_080_CLIENT_DH_BUG
+     },
+ #endif
+-#if SSL_OP_TLS_D5_BUG
++#ifdef SSL_OP_TLS_D5_BUG
+     {
+         "TLS_D5_BUG", SSL_OP_TLS_D5_BUG
+     },
+ #endif
+-#if SSL_OP_TLS_BLOCK_PADDING_BUG
++#ifdef SSL_OP_TLS_BLOCK_PADDING_BUG
+     {
+         "TLS_BLOCK_PADDING_BUG", SSL_OP_TLS_BLOCK_PADDING_BUG
+     },
+ #endif
+-#if SSL_OP_TLS_ROLLBACK_BUG
++#ifdef SSL_OP_TLS_ROLLBACK_BUG
+     {
+         "TLS_ROLLBACK_BUG", SSL_OP_TLS_ROLLBACK_BUG
+     },
+ #endif
+-#if SSL_OP_ALL
++#ifdef SSL_OP_ALL
+     {
+         "ALL", (long)SSL_OP_ALL
+     },
+ #endif
+-#if SSL_OP_SINGLE_DH_USE
++#ifdef SSL_OP_SINGLE_DH_USE
+     {
+         "SINGLE_DH_USE", SSL_OP_SINGLE_DH_USE
+     },
+ #endif
+-#if SSL_OP_EPHEMERAL_RSA
++#ifdef SSL_OP_EPHEMERAL_RSA
+     {
+         "EPHEMERAL_RSA", SSL_OP_EPHEMERAL_RSA
+     },
+ #endif
+-#if SSL_OP_PKCS1_CHECK_1
++#ifdef SSL_OP_PKCS1_CHECK_1
+     {
+         "PKCS1_CHECK_1", SSL_OP_PKCS1_CHECK_1
+     },
+ #endif
+-#if SSL_OP_PKCS1_CHECK_2
++#ifdef SSL_OP_PKCS1_CHECK_2
+     {
+         "PKCS1_CHECK_2", SSL_OP_PKCS1_CHECK_2
+     },
+ #endif
+-#if SSL_OP_NETSCAPE_CA_DN_BUG
++#ifdef SSL_OP_NETSCAPE_CA_DN_BUG
+     {
+         "NETSCAPE_CA_DN_BUG", SSL_OP_NETSCAPE_CA_DN_BUG
+     },
+ #endif
+-#if SSL_OP_NON_EXPORT_FIRST
++#ifdef SSL_OP_NON_EXPORT_FIRST
+     {
+         "NON_EXPORT_FIRST", SSL_OP_NON_EXPORT_FIRST
+     },
+ #endif
+-#if SSL_OP_CIPHER_SERVER_PREFERENCE
++#ifdef SSL_OP_CIPHER_SERVER_PREFERENCE
+     {
+         "CIPHER_SERVER_PREFERENCE", SSL_OP_CIPHER_SERVER_PREFERENCE
+     },
+ #endif
+-#if SSL_OP_NETSCAPE_DEMO_CIPHER_CHANGE_BUG
++#ifdef SSL_OP_NETSCAPE_DEMO_CIPHER_CHANGE_BUG
+     {
+         "NETSCAPE_DEMO_CIPHER_CHANGE_BUG", SSL_OP_NETSCAPE_DEMO_CIPHER_CHANGE_BUG
+     },
+ #endif
+-#if SSL_OP_NO_SSLv3
++#ifdef SSL_OP_NO_SSLv3
+     {
+         "NO_SSLv3", SSL_OP_NO_SSLv3
+     },
+ #endif
+-#if SSL_OP_NO_TLSv1
++#ifdef SSL_OP_NO_TLSv1
+     {
+         "NO_TLSv1", SSL_OP_NO_TLSv1
+     },
+ #else
+     { "NO_TLSv1", 0 },
+ #endif
+-#if SSL_OP_NO_TLSv1_1
++#ifdef SSL_OP_NO_TLSv1_1
+     {
+         "NO_TLSv1_1", SSL_OP_NO_TLSv1_1
+     },
+ #else
+     { "NO_TLSv1_1", 0 },
+ #endif
+-#if SSL_OP_NO_TLSv1_2
++#ifdef SSL_OP_NO_TLSv1_2
+     {
+         "NO_TLSv1_2", SSL_OP_NO_TLSv1_2
+     },
+ #else
+     { "NO_TLSv1_2", 0 },
+ #endif
+-#if SSL_OP_NO_TLSv1_3
++#ifdef SSL_OP_NO_TLSv1_3
+     {
+         "NO_TLSv1_3", SSL_OP_NO_TLSv1_3
+     },
+ #else
+     { "NO_TLSv1_3", 0 },
+ #endif
+-#if SSL_OP_NO_COMPRESSION
++#ifdef SSL_OP_NO_COMPRESSION
+     {
+         "No_Compression", SSL_OP_NO_COMPRESSION
+     },
+ #endif
+-#if SSL_OP_NO_TICKET
++#ifdef SSL_OP_NO_TICKET
+     {
+         "NO_TICKET", SSL_OP_NO_TICKET
+     },
+ #endif
+-#if SSL_OP_SINGLE_ECDH_USE
++#ifdef SSL_OP_SINGLE_ECDH_USE
+     {
+         "SINGLE_ECDH_USE", SSL_OP_SINGLE_ECDH_USE
+     },
+@@ -512,7 +512,7 @@ Security::PeerOptions::parseOptions()
+ 
+     }
+ 
+-#if SSL_OP_NO_SSLv2
++#ifdef SSL_OP_NO_SSLv2
+     // compliance with RFC 6176: Prohibiting Secure Sockets Layer (SSL) Version 2.0
+     op = op | SSL_OP_NO_SSLv2;
+ #endif