curl.h: clarify curl_sslbackend for openssl clones and renames

diff --git a/include/curl/curl.h b/include/curl/curl.h
index 5b5d723493d14ad9823a053dbf0ebcca9ba6d60a..57e716b3efdf09053417d5b85a2bc7feeffe58a3 100644 (file)
--- a/include/curl/curl.h
+++ b/include/curl/curl.h
@@ -2125,6 +2125,11 @@ typedef enum {
   CURLSSLBACKEND_MBEDTLS = 11
 } curl_sslbackend;
 
+/* aliases for library clones and renames */
+#define CURLSSLBACKEND_LIBRESSL 1
+#define CURLSSLBACKEND_BORINGSSL 1
+#define CURLSSLBACKEND_WOLFSSL 6
+
 /* Information about the SSL library used and the respective internal SSL
    handle, which can be used to obtain further information regarding the
    connection. Asked for with CURLINFO_TLS_SSL_PTR or CURLINFO_TLS_SESSION. */