``Command line too long'' from Make.

[Po Lu]

Trying to build the MS-DOS port presently results in protests from make:

Command line too long.
( printf 'shortlisp = \\\n'; \
sed -n 's/^[ \t]*(load "\([^"]*\)".*/\1/p' ../lisp/loadup.el | \
  sed -e 's/$/.elc \\/' -e 's/\.el\.elc/.el/'; \
echo "" ) > lisp.mk.tmp
make.exe: *** No rule to make target 'lisp.mk'.  Stop.

when generating lisp.mk.  What may be causing this?  Has loadup.el grown
to the point where its preloaded files now overflow a fixed-size MS-DOS
buffer, or is there a knob in COMMAND.COM that must be adjusted?

Thanks.