ARDUINO_ARCH_ESP32 forcing ESP32 internal CAN controller - Need MC2515

[atestani]

How do I use this library on an ESP32 (wroom-E32) with an MCP2515 external CAN controller. I am doing this project in PlatformIO with the Arduino framework. When I include CAN.h it checks ARDUINO_ARCH_ESP32 and selects the internal controller as ESP32SJA1000.h . If ARDUINO_ARCH_ESP32 is not defined (somehow) then MCP2515.h is included. This is the code in CAN.h:

#ifdef ARDUINO_ARCH_ESP32
#include "ESP32SJA1000.h"
#else
#include "MCP2515.h"
#endif

How do I get this to properly include MCP2515.h? I don't want to modify the CAN.h or any other part of the library unless this is the only way.