retval(1)

Makefile

@@ -33,6 +33,7 @@ cleanprograms:
 	$(RM) bin/str
 	$(RM) bin/substitute
 	$(RM) bin/sysexits
+	$(RM) bin/retval
 	$(RM) bin/rldecode
 	$(RM) bin/rlencode
 	$(RM) bin/roll
@@ -99,16 +100,22 @@ pscat.o: libio src/pscat.c
 pscat: libio pscat.o
 	$(CC) $(CFLAGS) -o bin/pscat build/libio.o build/pscat.o
 
+retval.o: libio src/retval.c sysexits
+	$(CC) $(CFLAGS) -c -o build/retval.o src/retval.c
+
+retval: libio retval.o
+	$(CC) $(CFLAGS) -o bin/retval build/retval.o build/libio.o
+
 roll.o: lib/libio.h src/roll.c sysexits
 	$(CC) $(CFLAGS) -c -o build/roll.o src/roll.c
 
-roll: libio sysexits roll.o
+roll: libio roll.o
 	$(CC) $(CFLAGS) -o bin/roll build/libio.o build/roll.o
 
 roll_stdio.o: lib/libio.h src/roll.c sysexits
 	$(CC) $(CFLAGS) -c -DUSE_STDIO -o build/roll_stdio.o src/roll.c
 
-roll_stdio: libio sysexits roll_stdio.o
+roll_stdio: libio roll_stdio.o
 	$(CC) $(CFLAGS) -o bin/roll_stdio build/libio.o build/roll_stdio.o
 
 rot13.o: libio sysexits src/rot13.c