I have been using .vhd files from here with good success in Intel's Quartus.

However in many cases I reach a roadblock. In all such cases there are multiple files to compile.
For example:-
I would like to make a .bdf module from the “Simple UART for FPGA” by Jakub Cabal.
The UART.vhd root file has at the start
use IEEE.STD_LOGIC_1164.ALL;
use IEEE.NUMERIC_STD.ALL;
use IEEE.MATH_REAL.ALL;
all of which are fine with Quartus.

But down a few lines there is:-
os_clk_divider_i : entity work.UART_CLK_DIV
generic map(
DIV_MAX_VAL => OS_CLK_DIV_VAL,
DIV_MARK_POS => OS_CLK_DIV_VAL-1
)

I get this a lot. Quartus gets hung up on finding the entity “work”
What do I need to add.
Thanks in advance
John

Frank Ieromnimom (IDE, Greece): RE: the work entity in QUARTUS

The Quartus tool is missing the entity UART_CLK_DIV, which should be compiled into the work library, where the rest of the files for the UART should be compiled as well.