Editing and compiling FreeBSD source

[Cantarella]

   This is my first e-mail for this list.
   I am interested in studing to better understand FreeBSD´s source code.
   With 'make buildkernel' and 'make installkernel' is it possible to
   compile the changes that I have made?
   The changes are simple (just some printf). I am just beginning this
   trip through FreeBSD´s source code.
   --
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   Cesar Cantarella
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