diff -cr grep-1.2.orig/Makefile grep-1.2/Makefile
*** grep-1.2.orig/Makefile	Fri Oct 14 06:11:28 1988
--- grep-1.2/Makefile	Sat Jan  7 02:36:42 1989
***************
*** 3,14 ****
  #
  
  # Add -DUSG for System V.
! CFLAGS = -O
  
  # You may add getopt.o if your C library lacks getopt(); note that
  # 4.3BSD getopt() is said to be somewhat broken.
  # Add alloca.o if your machine does not support alloca().
! OBJS = grep.o dfa.o regex.o
  
  all: regress
  
--- 3,14 ----
  #
  
  # Add -DUSG for System V.
! CFLAGS = -O -DUSG
  
  # You may add getopt.o if your C library lacks getopt(); note that
  # 4.3BSD getopt() is said to be somewhat broken.
  # Add alloca.o if your machine does not support alloca().
! OBJS = grep.o dfa.o regex.o alloca.o
  
  all: regress