build: Invalid inference name <name>
 
     The syntax of the target specifier in an inference rule was
     incorrect.
 
     The inference name must take the form:
 
          src.dst.
 
     The <src> is the filename extension of the source file. The <dst>
     is the filename extension of the output file. Each extension must
     be one, two, or three characters from the set [a-zA-Z0-9].
                                    -♦-