SLCD compile program (Ian McDonald library)

On some computers I cannot compile the example file. However maybe I could just recompile the library as I have the source code. Who could hint me here? The library and example helps to control SparkFun LCD very easily for at beginner like me


(These are my error messages:)

/Users/ianmcdougall/Applications/arduino-0011/hardware/libraries/SLCD/SLCD.cpp:6 8: undefined reference to `HardwareSerial::print(char)'

/Users/ianmcdougall/Applications/arduino-0011/hardware/libraries/SLCD/SLCD.cpp:6 9: undefined reference to `HardwareSerial::print(char)'

hardware\libraries\SLCD\SLCD.o: In function `SLCD::print(char const*)':

/Users/ianmcdougall/Applications/arduino-0011/hardware/libraries/SLCD/SLCD.cpp:9 5: undefined reference to `HardwareSerial::print(char const*)'

hardware\libraries\SLCD\SLCD.o: In function `SLCD::sendControl(char)':

/Users/ianmcdougall/Applications/arduino-0011/hardware/libraries/SLCD/SLCD.cpp:1 11: undefined reference to `HardwareSerial::print(char)'

/Users/ianmcdougall/Applications/arduino-0011/hardware/libraries/SLCD/SLCD.cpp:1 12: undefined reference to `HardwareSerial::print(char)'

hardware\libraries\SLCD\SLCD.o: In function `SLCD::print(char const*, int, int)' :

/Users/ianmcdougall/Applications/arduino-0011/hardware/libraries/SLCD/SLCD.cpp:8 7: undefined reference to `HardwareSerial::print(char const*)'

I have the same problem...would love to know what's going on with the compiling.