--- Makefiles/Makefile.freebsd.orig	Fri Aug  8 21:56:08 1997
+++ Makefiles/Makefile.freebsd	Fri Sep 19 08:59:04 1997
@@ -2,9 +2,9 @@
 # It has been tested under FreeBSD 2.1.5.
 
 # Change this if you have this stuff somewhere else.
-TCLINC = /usr/local/lib/tcl8.0
-TKINC  = /usr/local/lib/tk8.0
-X11INC = /usr/X11/include
+TCLINC = ${PREFIX}/include/tcl8.0
+TKINC  = ${PREFIX}/include/tk8.0
+X11INC = ${X11BASE}/include
 
 CFLAGS = -Wall -fPIC -O3 -I$(TCLINC) -I$(TKINC) -I$(X11INC)