--- Makefile.orig	Mon Jan 15 21:36:38 1996
+++ Makefile	Sat Sep  4 22:02:21 1999
@@ -15,13 +15,13 @@
 #
 # add -DUSE_READLINE	To compile in support for the GNU readline library.
 
-CFLAGS= -s -O2 -DUSE_READLINE
+CFLAGS+= -s -DUSE_READLINE
 CC= gcc
 LIBS= -lreadline -ltermcap
 ALLFILES= makefile cdgram.y cdlex.l cdecl.c cdecl.1 testset testset++
-BINDIR= /usr/bin
-MANDIR= /usr/man/man1
-CATDIR= /usr/man/cat1
+BINDIR= $(PREFIX)/bin
+MANDIR= $(PREFIX)/man/man1
+CATDIR= $(PREFIX/usr/man/cat1
 INSTALL= install -c
 INSTALL_DATA= install -c -m 644