I2S Library broken (Arduino example SimpleTone)

I2S Library in Arduino 1.8.13 with example SimpleTone is not compiling
… libraries\I2S\src\I2S.cpp:421:13: error: ‘GCLK_GENCTRL_SRC_DFLL48M_Val’ was not declared in this scope
Somebody can fix that?

I was able to compile with Zero, MKR1000 and MKRZero without any problems. (I don’t have a board so I just compile)
What are your board settings?