--- libyara/libyara.c.orig	2017-05-22 10:24:23.000000000 +0000
+++ libyara/libyara.c	2017-05-23 00:18:32.658793790 +0000
@@ -37,7 +37,7 @@
 #include <yara/mem.h>
 #include <yara/threading.h>
 
-#if defined(HAVE_LIBCRYPTO) && OPENSSL_VERSION_NUMBER < 0x10100000L
+#if defined(HAVE_LIBCRYPTO) && (OPENSSL_VERSION_NUMBER < 0x10100000L || defined(LIBRESSL_VERSION_NUMBER))
 #include <openssl/crypto.h>
 #endif
 
@@ -71,7 +71,7 @@
 char yr_altercase[256];
 
 
-#if defined(HAVE_LIBCRYPTO) && OPENSSL_VERSION_NUMBER < 0x10100000L
+#if defined(HAVE_LIBCRYPTO) && (OPENSSL_VERSION_NUMBER < 0x10100000L || defined(LIBRESSL_VERSION_NUMBER))
 
 // The OpenSSL library before version 1.1 requires some locks in order
 // to be thread-safe. These locks are initialized in yr_initialize
@@ -133,7 +133,7 @@
   FAIL_ON_ERROR(yr_thread_storage_create(&yr_tidx_key));
   FAIL_ON_ERROR(yr_thread_storage_create(&yr_recovery_state_key));
 
-  #if defined HAVE_LIBCRYPTO && OPENSSL_VERSION_NUMBER < 0x10100000L
+  #if defined HAVE_LIBCRYPTO && (OPENSSL_VERSION_NUMBER < 0x10100000L || defined(LIBRESSL_VERSION_NUMBER))
 
   openssl_locks = (YR_MUTEX*) OPENSSL_malloc(
       CRYPTO_num_locks() * sizeof(YR_MUTEX));
@@ -178,7 +178,7 @@
 
 YR_API int yr_finalize(void)
 {
-  #if defined HAVE_LIBCRYPTO && OPENSSL_VERSION_NUMBER < 0x10100000L
+  #if defined HAVE_LIBCRYPTO && (OPENSSL_VERSION_NUMBER < 0x10100000L || defined(LIBRESSL_VERSION_NUMBER))
   int i;
   #endif
 
@@ -194,7 +194,7 @@
   if (init_count > 0)
     return ERROR_SUCCESS;
 
-  #if defined HAVE_LIBCRYPTO && OPENSSL_VERSION_NUMBER < 0x10100000L
+  #if defined HAVE_LIBCRYPTO && (OPENSSL_VERSION_NUMBER < 0x10100000L || defined(LIBRESSL_VERSION_NUMBER))
 
   for (i = 0; i < CRYPTO_num_locks(); i ++)
     yr_mutex_destroy(&openssl_locks[i]);