Modelsim compiling error:(vcom-11) Could not find work.stratixiv_hssi_components

The error message indicates that the HDL code has a VHDL statement like

use work.stratixiv_hssi_components.all;

whereas you have compiled it into the VHDL library stratixiv.

Either compile it into the "work" library, or just edit the source to

library stratixiv;

use stratixiv.stratixiv_hssi_components.all;

I've had to edit Altera's source before due to "work" being used in some files, and "stratixiv" being used in others.

Cheers,

Dave