trying to understand: "warning: function declaration isn't a prototype"

[Jay Vaughan]

gcc: gcc version 2.95.3 20010315 (release)

i get these warnings on a project i'm trying to port using 
arm-linux-gcc .. is there some place i can find a more detailed 
description of what these warnings mean and how i can clean them up? 
i am having problems with my project and suspect that it is related 
to these prototypes being mis-handled as the function declaration, 
instead of just being handled as a prototype ..

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;

Jay Vaughan