anchor.diff:          ++ optional readlineSupport readline
           ++ optional sqliteSupport sqlite
           ++ optional postgresqlSupport postgresql
  +        ++ optional pdo_odbcSupport unixODBC
           ++ optional pdo_pgsqlSupport postgresql
           ++ optional pdo_mysqlSupport mysqlBuildInputs
           ++ optional mysqliSupport mysqlBuildInputs
  
positive.code:   , curlSupport ? config.php.curl or true
    , gettextSupport ? config.php.gettext or true
    , pcntlSupport ? config.php.pcntl or true
    , postgresqlSupport ? config.php.postgresql or true
    , pdo_pgsqlSupport ? config.php.pdo_pgsql or true
    , readlineSupport ? config.php.readline or true
  
negative.code:       ++ optional readlineSupport "--with-readline=${readline.dev}"
        ++ optional sqliteSupport "--with-pdo-sqlite=${sqlite.dev}"
        ++ optional postgresqlSupport "--with-pgsql=${postgresql}"
        ++ optional pdo_odbcSupport "--with-pdo-odbc=unixODBC,${unixODBC}"
        ++ optional pdo_pgsqlSupport "--with-pdo-pgsql=${postgresql}"
        ++ optional pdo_mysqlSupport "--with-pdo-mysql=${if mysqlndSupport then "mysqlnd" else mysql.connector-c}"
        ++ optionals mysqliSupport [
  