optional_depends %OSSL \
                 "--with-openssl" \
                 "--without-openssl" \
                 "for SSL support"

optional_depends gnutls \
                 "--with-gnutls" \
                 "--without-gnutls" \
                 "for gnutls support"

optional_depends protobuf-c \
                 "--with-protobuf" \
                 "--without-protobuf" \
                 "for Protocol Buffers support"
