Change into this directory, and you'll see there are several subdirectories. Providing there are no missing libraries or other errors, running make will, after a rather long time, build POSE and several support programs. It's important to note that POSE only simulates the Palm Pilot hardware, but doesn't include any of the PalmOS code. For this, a ROM image is required. Don't use the ROM transfer programs included with pilot-link on newer Palms, as the programs don't understand the larger ROM sizes.
Details are available here .
A window will pop up with instructions. Follow these, and a few minutes later you'll have a ROM image on your hard drive. Developers often have several different ROM images available to test with. Using unmatched ROM to Device types can be unpredictable, so try to only use appropriate settings. Using a IIIe's ROM under the IIIc hardware doesn't work, for example.