MiniCore - An Arduino core for the ATmega8/ 48/ 88/ 168/ 328

Hello,
I'm unable to compile code for an Atmega328PB using the IridiumSBD library with the MiniCore. Error shows up when it tries to link the files:

IridiumSBD.cpp.o:(.rodata+0x0): undefined reference to `IridiumSBD::internalBegin()::__c'

Confirmed that it is linking the library in, and the 'internalBegin' function is defined within. Has anyone else tried to use this library with the MiniCore?
Thank you