Cannot load library: Cannot load library PCBUSB: dlopen(PCBUSB, 0x0005)

[Pepe424]

When using the PeakCAN plugin from QtSerialBus on macOS, the plugin fails to load the required PCBUSB dynamic library.

By default, the PCBUSB driver installs to:

/usr/local/lib

However, Qt 6.8 attempts to load the library from several locations, including:

... '/usr/lib/PCBUSB' (no such file, not in dyld cache)

Since PCBUSB is not installed under /usr/lib, the PeakCAN plugin fails to load unless manual workarounds are applied.

To make the plugin work, I have to manually add a symlink to the bundled library:

• either inside the app bundle, e.g.:

MyApp.app/Contents/Frameworks/libPCBUSB.dylib

• or next to the application binary during local development.

At the moment it is unclear what the correct long-term solution should be:
• Should the PCBUSB driver installer be updated to place the dylib somewhere Qt can find it?
• Should QtSerialBus / PeakCAN be patched to include /usr/local/lib or another search path?

Summary

The PeakCAN plugin currently does not locate libPCBUSB.dylib in its default installation directory on macOS, which forces manual symlink creation during development and deployment.