diff --git a/common-src/glib-util.c b/common-src/glib-util.c
index cbd8642..1ab1261 100644
--- a/common-src/glib-util.c
+++ b/common-src/glib-util.c
@@ -40,7 +40,8 @@
 #if (defined HAVE_LIBCURL && defined LIBCURL_USE_OPENSSL) || defined SSL_SECURITY
 #include <openssl/crypto.h>
 #include <openssl/ssl.h>
-#if OPENSSL_VERSION_NUMBER < 0x10100000L
+#if (defined OPENSSL_VERSION_NUMBER && OPENSSL_VERSION_NUMBER < 0x10100000L) \
+    || defined LIBRESSL_VERSION_NUMBER
 static GMutex **openssl_mutex_array;
 static void openssl_lock_callback(int mode, int type, const char *file, int line)
 {
@@ -58,7 +59,8 @@ static void openssl_lock_callback(int mode, int type, const char *file, int line
 static void
 init_openssl(void)
 {
-#if OPENSSL_VERSION_NUMBER < 0x10100000L
+#if (defined OPENSSL_VERSION_NUMBER && OPENSSL_VERSION_NUMBER < 0x10100000L) \
+    || defined LIBRESSL_VERSION_NUMBER
     int i;
     openssl_mutex_array = g_new0(GMutex *, CRYPTO_num_locks());
 
diff --git a/config/amanda/amanda_configure.m4 b/config/amanda/amanda_configure.m4
index e45505a..3333576 100644
--- a/config/amanda/amanda_configure.m4
+++ b/config/amanda/amanda_configure.m4
@@ -94,9 +94,9 @@ AMANDA_BSD_SECURITY
 AMANDA_BSDTCP_SECURITY
 AMANDA_BSDUDP_SECURITY
 AMANDA_RSH_SECURITY
+AMANDA_SSL_SECURITY
 AMANDA_SSH_SECURITY
 AMANDA_KRB5_SECURITY
-AMANDA_SSL_SECURITY
 
 #
 # Dumpers
diff --git a/device-src/Makefile.am b/device-src/Makefile.am
index 93593fe..43765b3 100644
--- a/device-src/Makefile.am
+++ b/device-src/Makefile.am
@@ -29,7 +29,7 @@ CLEANFILES += $(SCRIPTS_PERL) config.log
 ## libamdevice.la
 
 amlib_LTLIBRARIES = 	libamdevice.la
-libamdevice_la_LDFLAGS = -release $(VERSION) $(AS_NEEDED_FLAGS)
+libamdevice_la_LDFLAGS = -release $(VERSION) $(AS_NEEDED_FLAGS) -ldl
 libamdevice_la_SOURCES = \
 	property.c \
 	device.c \
diff --git a/device-src/s3-util.c b/device-src/s3-util.c
index ab909fa..e09c943 100644
--- a/device-src/s3-util.c
+++ b/device-src/s3-util.c
@@ -239,7 +239,9 @@ EncodeHMACSHA256(
     unsigned char tk[SHA256_DIGEST_LENGTH];
 
     // Initialise HMACh
-#if OPENSSL_VERSION_NUMBER < 0x10100000L
+#if (defined OPENSSL_VERSION_NUMBER && OPENSSL_VERSION_NUMBER < 0x10100000L) \
+    || defined LIBRESSL_VERSION_NUMBER
+
     HMAC_CTX HMAC;
 #else
     HMAC_CTX *HMAC;
@@ -254,7 +256,8 @@ EncodeHMACSHA256(
     }
 
     // Digest the key and message using SHA256
-#if OPENSSL_VERSION_NUMBER < 0x10100000L
+#if (defined OPENSSL_VERSION_NUMBER && OPENSSL_VERSION_NUMBER < 0x10100000L) \
+    || defined LIBRESSL_VERSION_NUMBER
     HMAC_CTX_init(&HMAC);
     HMAC_Init_ex(&HMAC, key, keylen, EVP_sha256(),NULL);
     HMAC_Update(&HMAC, datatohash, datalen);
diff --git a/device-src/s3.c b/device-src/s3.c
index c87d924..c472f3c 100644
--- a/device-src/s3.c
+++ b/device-src/s3.c
@@ -846,7 +846,8 @@ authenticate_request(S3Handle *hdl,
     char *szS3Date = NULL;
     char *zulu_date = NULL;
     char *buf = NULL;
-#if OPENSSL_VERSION_NUMBER < 0x10100000L
+#if (defined OPENSSL_VERSION_NUMBER && OPENSSL_VERSION_NUMBER < 0x10100000L) \
+    || defined LIBRESSL_VERSION_NUMBER
     HMAC_CTX ctx;
 #else
     HMAC_CTX *ctx;
@@ -1209,7 +1210,8 @@ authenticate_request(S3Handle *hdl,
 
 	/* run HMAC-SHA1 on the canonicalized string */
 	md = g_byte_array_sized_new(EVP_MAX_MD_SIZE+1);
-#if OPENSSL_VERSION_NUMBER < 0x10100000L
+#if (defined OPENSSL_VERSION_NUMBER && OPENSSL_VERSION_NUMBER < 0x10100000L) \
+    || defined LIBRESSL_VERSION_NUMBER
 	HMAC_CTX_init(&ctx);
 	HMAC_Init_ex(&ctx, hdl->secret_key, (int) strlen(hdl->secret_key),
 		     EVP_sha1(), NULL);