Old Verilog Library not recognized by Compiler

Hi,

Im not sure what version and type of Quartus you use, but as I know the support features for language type is varies for different language and also limited for each Quartus and this issue could be one of the reason the Verilog library is not recognized. Can refer to link below for comparison support features Quartus

https://www.intel.com/content/dam/www/programmable/us/en/pdfs/literature/po/ss-quartus-comparison.pdf

Thanks,

Regards