I understand the question is 3 years old, but today I ran into the same misunderstanding of the included readme file.
The solution to build the library on mac is to run (in the mac folder, using Terminal) the following:
make -f Makefile-manual
This will build the lib and you can then test the results by running the test program included:
./hidtest
The results should be similar to:
Device Found
type: 05ac 025a
path: IOService:/AppleACPIPlatformExpert/PCI0@0/AppleACPIPCI/XHC1@14/XHC1@14000000/HS05@14400000/Apple Internal Keyboard / Trackpad@14400000/Touchpad@1/AppleUSBMultitouchDriver@14400000,1
serial_number:
Manufacturer: Apple Inc.
Product: Apple Internal Keyboard / Trackpad
Release: 224
Interface: -1
Device Found
type: 05ac 030d
path: IOService:/IOResources/IOBluetoothHCIController/AppleBroadcomBluetoothHostController/IOBluetoothDevice/IOBluetoothL2CAPChannel/BNBMouseDevice
serial_number: **-**-**-**-**-**
Manufacturer: Apple
Release: 306
Interface: -1
...