If i test something like this i copy file.dll and file.lib to project folder.
Then i add in poide menu Project -> Project options.. -> Folders -> Libraries my project folder
and same to Includes.
I don't add any lib or include files to PellesC folders.
I like to keep PellesC folder as original state.
The original proposal resulted in an error message (could not find .def file ..)
Do this in folder where you put that libusb0.def (project folder ?)
"C:\Program Files\PellesC\Bin\polib.exe" /MACHINE:X86 /out:libusb0.lib /def:libusb0.def
libusb0.lib in attachment.