-CFLAGS=-O -DV7
-XSTR=/usr/ucb/xstr
-DESTDIR=/usr/src
-CTAGS=/usr/ucb/ctags -w
-VPRINT=/usr/ucb/print
-CGRAF=/ja/rigel/rigel/bin/cgraf
-CGRAPH=/ja/rigel/rigel/bin/cgraph
-NMKINDEX=/ja/rigel/rigel/bin/nmkindex
-DIRTCLOD=/ja/rigel/rigel/bin/dirtclod
-LIBES=
-ED=-ed
-AS=-as
-RM=-rm
-OBJS=version.o aux.o cmd1.o cmd2.o cmd3.o cmdtab.o collect.o \
- config.o edit.o fio.o \
+OPTIONS= -DV7 -DVMUNIX # vfork and job control
+#OPTIONS= -DV7 # no vfork or no job control
+
+LDFLAGS= -i # for separate I/D machines
+#LDFLAGS= -n # for nonseparate I/D machines
+
+CFLAGS= -O ${OPTIONS} ${INCLUDES} # for separate I/D machines
+#CFLAGS= -O -V ${OPTIONS} ${INCLUDES} # for nonseparate I/D machines
+
+LIBES= -ljobs -lc # for separate I/D machines
+#LIBES= -lovjobs -lovc # for nonseparate I/D machines
+
+SIGRETROSRC= # for those with job control
+SIGRETROOBJ= # for those with job control
+#SIGRETROSRC= sigretro.c # for those without job control
+#SIGRETROOBJ= sigretro.o # for those without job control
+
+XSTR= /usr/ucb/xstr
+DESTDIR= /
+CTAGS= /usr/ucb/ctags -w
+ED= -ed
+AS= -as
+RM= -rm
+OBJS=aux.o cmd1.o cmd2.o cmd3.o cmdtab.o collect.o config.o edit.o fio.o \