The error is saying that "enemydead" is not a variable of the "you" structure.
Is enemydead supposed to be a skill, or a redefined skill maybe? Where is "enemydead" from?
You cannot add your own variables to the predefined entity structures, but you can redefine their skills to reflect more user friendly names;
#define enemydead skill[99]
Now saying enemydead would be the same as saying skill[99]