depends  zlib  &&

optional_depends  gnutls                                       \
                  "--with-gnutls=$INSTALL_ROOT/usr"            \
                  '--without-gnutls'                           \
                  'for encrypted communications using GNUTLS'  &&

optional_depends  openssl                          \
                  "--with-ssl=$INSTALL_ROOT/usr"   \
                  '--without-ssl'                  \
                  "for https encrypted transport"  &&

optional_depends  libssh2                              \
                  "--with-libssh2=$INSTALL_ROOT/usr"   \
                  '--without-libssh2'                  \
                  "for SSH (SCP and SFTP) support"     &&

optional_depends  c-ares                                                       \
                  "--enable-ares=$INSTALL_ROOT/usr"                            \
                  '--disable-ares'                                             \
                  "to performs DNS requests and name resolves asynchronously"  &&

optional_depends  libidn                                   \
                  "--with-libidn=$INSTALL_ROOT/usr"        \
                  '--without-libidn'                       \
                  'for International Domain Name support'
