Don't Starve: Hamlet minimum requirements for Windows assume having at least Windows XP/Vista/Windows 7/Windows 8 operating system. Your processor should be 1.7+ GHz or a more powerful one. The minimum RAM requirement is 1+ gigs of GB. As for a graphics card, it should be Radeon HD5450 ; 256 MB or higher, and it should support Direct X 9.0c. You also have to have 500 MB HD space free disk space to install the game.
As for Mac OS, Don't Starve: Hamlet requirements here start with Lion (OSX 10.7.X) operating system. Processor needs to be at least 2.0 GHz Intel. 4 GB of RAM is required. Your graphics card should be 256 MB NVidia or ATI graphics card. Finally, the game needs 512 MB Free Space of free disk space.
Don't Starve: Hamlet Linux Requirements
Don't Starve: Hamlet system requirements for Linux