VARCHAR2 greater than 4K?

Folks,

  I was reading Chapter 4 of Pro*C/C++ Precompiler Programmer's Guide. In it   they say the Oracle Internal Datatype VARCHAR2 must be less than 4000 bytes   (page 4-2), and Oracle external Datatype VARCHAR2 must be less than 65535   bytes (page 4-4).

  How can I define a VARCHAR2 column greater than 4000 bytes?

  When I try to create table using PL/SQL I get following error:

  ORA-00910: specified length too long for its datatype

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