How to use spi interface on EPCQ64 device with Quartus v18.0?

Hopefully this question isn't too vague but ...

We are switching our FPGA from I believe an EPCS64 Cyclone III (developed using Quartus v11.1) to an EPCQ64 Cyclone 10 device (using Quartus v18.0). The altera_avalon_spi.c, altera_avalon_spi.h and altera_avalon_spi_regs.h files are no longer available when I build my bsp_10c40 file for the new device so I have many errors on undefined references to things that were defined in those files. What am I supposed to use in their place with the new device and/or new version of Quartus? Thank you in advance.