Use LibreSSL.

Index: configure.ac
--- configure.ac.orig
+++ configure.ac
@@ -1184,7 +1184,7 @@ SASL_SET_GSSAPI_LIBS
 dnl
 dnl Check for OpenSSL library, needed for TLS support
 dnl
-PKG_CHECK_MODULES([SSL], [openssl >= 3.0], [],
+PKG_CHECK_MODULES([SSL], [openssl], [],
                   AC_MSG_ERROR([openssl is required]))
 dnl call AC_SUBST macro to support pkg-config version older than 0.24
 AC_SUBST([SSL_LIBS])
