simple.fls is generated.
Makefiles variable -- TEXFILES= LATEXINTFILES= GRAPHICFILES= BIBDB=
simple.d is generated by scanning simple.tex and simple.fls.
platex -interaction=batchmode simple.tex
! Undefined control sequence.
simple.tex:4: l.4 「何人もの\textbt
                     {ニュートン}がいた（There were several Newtons）」
The control sequence at the end of the top line
of your error message was never \def'ed. If you have
misspelled it (e.g., `\hobx'), type `I' and the correct
spelling (e.g., `I\hbox'). Otherwise just continue,
and I'll forget about whatever was undefined.

make: *** [simple.dvi] Error 1