optional_depends  MYSQL                  \
                  "--with-mysql"         \
                  "--without-mysql"      \
                  "for MySQL user auth"  &&

optional_depends  postgresql                  \
                  "--with-pgsql"              \
                  "--without-pgsql"           \
                  "for PostgreSQL user auth"  &&

optional_depends  linux-pam                 \
                  "--with-pam"              \
                  ""                        \
                  "for PAM authentication"    &&

optional_depends  openldap                    \
                  "--with-ldap"               \
                  "--without-ldap"            \
                  "for openldap user accounts"  &&

optional_depends  SSL                \
                  "--with-tls"           \
                  "--without-tls"        \
                  "for SSL/TLS support"