--- ../Makefile.orig	2017-01-23 20:14:37.000000000 +0100
+++ ./Makefile	2019-10-24 21:25:57.022914016 +0200
@@ -7,9 +7,9 @@
 # sets of values appear below; uncomment one of them and change the
 # directories appropriately.
 
-GLKINCLUDEDIR = ../cheapglk
-GLKLIBDIR = ../cheapglk
-GLKMAKEFILE = Make.cheapglk
+GLKINCLUDEDIR = glkterm
+GLKLIBDIR = glkterm
+GLKMAKEFILE = Make.glktermw
 
 #GLKINCLUDEDIR = ../glkterm
 #GLKLIBDIR = ../glkterm
@@ -38,10 +38,9 @@
 # (MacOS always uses ARC4, in case you were wondering.)
 
 # Pick a C compiler.
-CC = cc
 #CC = gcc
 
-OPTIONS = -g -Wall -Wmissing-prototypes -Wno-unused -DOS_MAC
+OPTIONS := $(CFLAGS) -DOS_UNIX
 
 # Locate the libxml2 library. You only need these lines if you are using
 # the VM_DEBUGGER option. If so, uncomment these and set appropriately.