--- ./config.tests/unix/openssl11/openssl.cpp.orig	2018-04-24 09:59:45.918038335 +0200
+++ ./config.tests/unix/openssl11/openssl.cpp	2018-04-24 10:01:21.255182441 +0200
@@ -42,6 +42,9 @@
 #if !defined(OPENSSL_VERSION_NUMBER) || OPENSSL_VERSION_NUMBER-0 < 0x10100000L
 #  error "OpenSSL >= 1.1 is required"
 #endif
+#ifdef LIBRESSL_VERSION_NUMBER
+#  error "LibreSSL does not support all used OpenSSL-1.1 APIs yet."
+#endif
 
 int main()
 {
--- ./src/network/ssl/qsslsocket_openssl_symbols_p.h.orig	2018-04-24 10:40:49.121761681 +0200
+++ ./src/network/ssl/qsslsocket_openssl_symbols_p.h	2018-04-24 10:41:43.082843248 +0200
@@ -232,7 +232,7 @@ BIO *q_BIO_new_mem_buf(void *a, int b);
 int q_BIO_read(BIO *a, void *b, int c);
 Q_AUTOTEST_EXPORT int q_BIO_write(BIO *a, const void *b, int c);
 int q_BN_num_bits(const BIGNUM *a);
-#if OPENSSL_VERSION_NUMBER >= 0x10100000L
+#if OPENSSL_VERSION_NUMBER >= 0x10100000L && !defined(LIBRESSL_VERSION_NUMBER)
 int q_BN_is_word(BIGNUM *a, BN_ULONG w);
 #else
 // BN_is_word is implemented purely as a
