diff -Naur wvstreams-4.6.1.orig/crypto/wvx509.cc wvstreams-4.6.1/crypto/wvx509.cc
--- wvstreams-4.6.1.orig/crypto/wvx509.cc	2008-10-23 22:23:49.000000000 +0200
+++ wvstreams-4.6.1/crypto/wvx509.cc	2018-05-10 09:25:27.106684000 +0200
@@ -1157,7 +1157,11 @@
         
         if (ext)
         {
-            X509V3_EXT_METHOD *method = X509V3_EXT_get(ext);
+#if OPENSSL_VERSION_NUMBER >= 0x10000000L
+            const X509V3_EXT_METHOD *method = X509V3_EXT_get(ext);
+#else
+            X509V3_EXT_METHOD *method = (X509V3_EXT_METHOD *)X509V3_EXT_get(ext);
+#endif
             if (!method)
             {
                 WvDynBuf buf;