compile time error "'MbedSPI' does not name a type" with core arduino-pico

[SamHalvoe]

Hello Larry,

first of all I like your OneBitDisplay library and had fun using it in one of my projects. (:
At the moment I use the core ArduinoCore-mbed and it works fine.
But now I want to switch to the core arduino-pico and there I get compile time errors when using OneBitDisplay (see compiler output below).
Could you have a look?
Thank you very much.

Best regards,
Samuel

compiler output:

In file included from c:\Users\samue\OneDrive\Dokumente\Arduino\libraries\OneBitDisplay\src\OneBitDisplay.cpp:57:
c:\Users\samue\OneDrive\Dokumente\Arduino\libraries\OneBitDisplay\src\obd_io.inl:76:1: error: 'MbedSPI' does not name a type
   76 | MbedSPI *mySPI;
      | ^~~~~~~
c:\Users\samue\OneDrive\Dokumente\Arduino\libraries\OneBitDisplay\src\obd_io.inl: In function 'void initSPI(OBDISP*, int, int, int, int)':
c:\Users\samue\OneDrive\Dokumente\Arduino\libraries\OneBitDisplay\src\obd_io.inl:97:5: error: 'mySPI' was not declared in this scope; did you mean 'SPI'?
   97 |     mySPI = new MbedSPI(-1,iMOSI,iCLK);
      |     ^~~~~
      |     SPI
c:\Users\samue\OneDrive\Dokumente\Arduino\libraries\OneBitDisplay\src\obd_io.inl:97:17: error: expected type-specifier before 'MbedSPI'
   97 |     mySPI = new MbedSPI(-1,iMOSI,iCLK);
      |                 ^~~~~~~
c:\Users\samue\OneDrive\Dokumente\Arduino\libraries\OneBitDisplay\src\obd_io.inl:83:32: warning: unused parameter 'iSpeed' [-Wunused-parameter]
   83 | void initSPI(OBDISP *pOBD, int iSpeed, int iMOSI, int iCLK, int iCS)
      |                            ~~~~^~~~~~
c:\Users\samue\OneDrive\Dokumente\Arduino\libraries\OneBitDisplay\src\obd_io.inl:83:65: warning: unused parameter 'iCS' [-Wunused-parameter]
   83 | void initSPI(OBDISP *pOBD, int iSpeed, int iMOSI, int iCLK, int iCS)
      |                                                             ~~~~^~~
In file included from c:\Users\samue\OneDrive\Dokumente\Arduino\libraries\OneBitDisplay\src\OneBitDisplay.cpp:57:
c:\Users\samue\OneDrive\Dokumente\Arduino\libraries\OneBitDisplay\src\obd_io.inl: In function 'void RawWrite(OBDISP*, unsigned char*, int)':
c:\Users\samue\OneDrive\Dokumente\Arduino\libraries\OneBitDisplay\src\obd_io.inl:319:13: error: 'mySPI' was not declared in this scope; did you mean 'SPI'?
  319 |             mySPI->transfer(pData[i]);
      |             ^~~~~
      |             SPI
c:\Users\samue\OneDrive\Dokumente\Arduino\libraries\OneBitDisplay\src\obd_io.inl: In function 'void RawWriteData(OBDISP*, unsigned char*, int)':
c:\Users\samue\OneDrive\Dokumente\Arduino\libraries\OneBitDisplay\src\obd_io.inl:368:13: error: 'mySPI' was not declared in this scope; did you mean 'SPI'?
  368 |             mySPI->transfer(pData[i]);
      |             ^~~~~
      |             SPI
c:\Users\samue\OneDrive\Dokumente\Arduino\libraries\OneBitDisplay\src\obd_io.inl:373:15: error: 'mySPI' was not declared in this scope; did you mean 'SPI'?
  373 |               mySPI->transfer(pData[i]);
      |               ^~~~~
      |               SPI
Multiple libraries were found for "SD.h"
  Used: C:\Users\samue\AppData\Local\Arduino15\packages\rp2040\hardware\rp2040\3.1.0\libraries\SD
  Not used: C:\Users\samue\OneDrive\Dokumente\Arduino\libraries\SD
exit status 1

Compilation error: exit status 1