Since the C language example does not compile, it seems to be necessary to add the bin directory.

Hello,
  I tested the 2.9 inch Touch e-paper HAT source. By the way, the python source worked without problems. However, the C language source was not compiled.

The reason was found to be an error that occurred because there was no bin directory in the "/Touch_e-Paper_HAT/c" path.

I think the bin directory should be created automatically or by default.

thank you.