Allow complex.mk to succeed under parse_makefile

[reteps]

I have minimal understanding of this codebase, but it seems the complex.mk file fails to parse.

AUX =   README COPYING ChangeLog Makefile.in  \
        makefile.pc configure configure.in \
        tar.texinfo tar.info* texinfo.tex \
        tar.h port.h open3.h getopt.h regex.h \
        rmt.h rmt.c rtapelib.c alloca.c \
        msd_dir.h msd_dir.c tcexparg.c \
        level-0 level-1 backup-specs testpad.c
.PHONY: shar
shar: $(SRCS) $(AUX)
	shar $(SRCS) $(AUX) | compress \
          > tar-`sed -e '/version_string/!d' \
                     -e 's/[^0-9.]*\([0-9.]*\).*/\1/' \
                     -e q \
                     version.c`.shar.Z