GHDL gives an example of adder instantiation, using components
 
        adder_0: adder port map (i0 => i0, i1 => i1, ci => ci,
                                 s => s, co => co);
 
which works. I tried to get rid of the component, making direct instantiation of the entity
 
        adder_0: entity adder port map (i0 => i0, i1 => i1, ci => ci,
                                 s => s, co => co);
 
But, it says 
 
> no declaration for "adder"
 
What is wrong?
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