--- a/Utilities/cmlibarchive/libarchive/archive_openssl_evp_private.h
+++ b/Utilities/cmlibarchive/libarchive/archive_openssl_evp_private.h
@@ -28,7 +28,7 @@
 #include <openssl/evp.h>
 #include <openssl/opensslv.h>
 
-#if OPENSSL_VERSION_NUMBER < 0x10100000L
+#if OPENSSL_VERSION_NUMBER < 0x10100000L || defined(LIBRESSL_VERSION_NUMBER)
 #include <stdlib.h> /* malloc, free */
 #include <string.h> /* memset */
 static inline EVP_MD_CTX *EVP_MD_CTX_new(void)
--- a/Utilities/cmlibarchive/libarchive/archive_openssl_hmac_private.h
+++ b/Utilities/cmlibarchive/libarchive/archive_openssl_hmac_private.h
@@ -28,7 +28,7 @@
 #include <openssl/hmac.h>
 #include <openssl/opensslv.h>
 
-#if OPENSSL_VERSION_NUMBER < 0x10100000L
+#if OPENSSL_VERSION_NUMBER < 0x10100000L || defined(LIBRESSL_VERSION_NUMBER)
 #include <stdlib.h> /* malloc, free */
 #include <string.h> /* memset */
 static inline HMAC_CTX *HMAC_CTX_new(void)
