depends gmp &&
depends pkgconfig &&
  optional_depends curl     '--enable-curl'  \
                            '' \
                            'fetch Certificates and CRLs via http'  &&
  optional_depends libgcrypt '--enable-gcrypt' \
                            '' \
                            'libgcrypt plugin' &&
  optional_depends openssl  '--enable-openssl' \
                            '' \
                            'OpenSSL crypto plugin' &&
  optional_depends openssh  '--enable-agent' \
                            '' \
                            'ssh-agent signing plugin' &&
  optional_depends openldap '--enable-ldap'  \
                            '' \
                            'fetch CRLs from LDAP'   &&
  optional_depends opensc   '--enable-smartcard'  \
                            '' \
                            'enable smartcard support'
