[Quickcall] quickcalld can't get idVendor

[Luke]

Hi David,
I have just got a Logitech F-0590B Cordless Internet Handset, and I am 
having trouble getting it working on Linux.

I am using Ubuntu MATE 16.04, and

  * Downloaded the GIT repository
  * Installed libusb-dev and libasound2-dev.
  * Built the program with make
  * Tried to run the resulting binary file (quickcalld)
  * It asks for a sysfs directory,

    $ sudo ./quickcalld -v /sys
    Probing /sys...
    Probing for Quickcall at /sys
    Couldn't get idVendor from /sys: No such file or directory

Have you got any suggestions?

Thanks,

Luke

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