Grove/Seeedstudio Serial LCD help

Other Hardware Displays
4

Also, when I try to verify the "HelloWorld" program this is what I get …

HelloWorld.pde:-1: error: 'SerialLCD' does not name a type
HelloWorld.cpp: In function 'void setup()':
HelloWorld.pde:-1: error: 'slcd' was not declared in this scope
HelloWorld.cpp: In function 'void loop()':
HelloWorld.pde:-1: error: 'slcd' was not declared in this scope

Does it matter that I use a mac?

Thanks,
Drew Davis