Compilling Error

In SoftwareSerial.h, change this line:

    void write(uint8_t);

To :

    size_t write(uint8_t);

And in SoftwareSerial.cpp, change this:

size_t SoftwareSerial::write(uint8_t )
{
  if (_baudRate == 0)
    return;
  ...
  ...

To:

size_t SoftwareSerial::write(uint8_t )
{
  if (_baudRate == 0)
    return 0;
  ...
  ...