request 1.1x API compatibility for OpenSSL >=3.x

idea/patch from Pedro Martelletto via GHPR#322; ok dtucker@

diff --git a/configure.ac b/configure.ac
index 62c098d6dc7ada1919c704f25a6ad614e1ec82c0..116b9750db4dc61d15c60d389984938fce56c820 100644 (file)
--- a/configure.ac
+++ b/configure.ac
@@ -2796,8 +2796,13 @@ if test "x$openssl" = "xyes" ; then
                                ;;
                        101*)   ;; # 1.1.x
                        200*)   ;; # LibreSSL
-                       300*)   ;; # OpenSSL 3
-                       301*)   ;; # OpenSSL development branch.
+                       300*)
+                               # OpenSSL 3; we use the 1.1x API
+                               CPPFLAGS="$CPPFLAGS -DOPENSSL_API_COMPAT=0x10100000L"
+                               ;;
+                       301*)
+                               # OpenSSL development branch; request 1.1x API
+                               CPPFLAGS="$CPPFLAGS -DOPENSSL_API_COMPAT=0x10100000L"
                        *)
                                AC_MSG_ERROR([Unknown/unsupported OpenSSL version ("$ssl_library_ver")])
                                ;;