Modelsim-altera starter - Instantiation of 'dcfifo' failed. The design unit was not f

You might end up here if you're trying to figure how to simply use Altera libraries in your simulation.

Add the -L <library> name like below.

vsim -t 100ps -L altera_mf_ver -L altera_mf work.Example_Fifo_tb

https://www.intel.com/content/www/us/en/programmable/support/support-resources/knowledge-base/solutions/rd07172013_482.html