Index: reflow/dtls_wrapper/DtlsSocket.hxx
--- reflow/dtls_wrapper/DtlsSocket.hxx.orig
+++ reflow/dtls_wrapper/DtlsSocket.hxx
@@ -14,11 +14,13 @@ extern "C" 
 #include "../Srtp2Helper.hxx"
 }
 
-#include <openssl/e_os2.h>
 #include <openssl/rand.h>
 #include <openssl/err.h>
 #include <openssl/crypto.h>
 #include <openssl/ssl.h>
+#ifndef LIBRESSL_VERSION_NUMBER
+#include <openssl/e_os2.h>
+#endif
 
 namespace dtls
 {
