diff -N src/s/darwin.h
--- /dev/null	Thu May  3 03:14:20 2001
+++ src/s/darwin.h	Thu May  3 21:23:19 2001
@@ -0,0 +1,18 @@
+/* s/ file for Darwin/MacOS X systems */
+
+#define SYSTEM_TYPE "darwin"
+
+/* Defines this as a BSD system, used in fakemail, for example */
+#ifndef NOT_C_CODE
+#include <sys/param.h>
+#endif
+
+/* The builtin malloc is broken in the sense that replacing it
+   with a user implementation is impossible. */
+#define SYSTEM_MALLOC
+
+#define HAVE_PTYS
+
+/* TAB3 is defined in Unix98, but darwin doesn't have it. 
+   OXTABS is the traditional BSD equivalent. */
+#define TAB3 OXTABS
diff -u -w -r1.151 configure.in
--- configure.in	2001/04/12 18:20:41	1.151
+++ configure.in	2001/05/04 04:23:21
@@ -1205,6 +1205,13 @@
   dnl Cubix QBx/386
   i[[3-9]]86-cubix-sysv* ) machine=intel386 opsys=usg5-3 ;;
 
+  dnl Darwin, a.k.a. MacOS X (based on Mach and Freebsd)
+  *-*-darwin*)
+    opsys=darwin
+    RANLIB="ranlib -c" dnl Avoids a link error with lwlib-config.c
+    pdump=yes          dnl No "native" working dumper available
+    ;;
+
   dnl Data General AViiON Machines
   i586-dg-dgux*R4*   | i586-dg-dgux5.4.4* ) machine=aviion opsys=dgux5-4r4 ;;
   m88k-dg-dgux5.4R3* | m88k-dg-dgux5.4.3* ) opsys=dgux5-4r3 ;;
diff -Naur configure.old configure.in
--- configure.old	Mon May 28 01:40:19 2001
+++ configure	Mon May 28 00:08:22 2001
@@ -1238,6 +1238,12 @@
 
     i[3-9]86-cubix-sysv* ) machine=intel386 opsys=usg5-3 ;;
 
+    *-*-darwin* )
+    opsys=darwin
+    RANLIB="ranlib -c" 
+    pdump=yes          
+    ;;
+
     i586-dg-dgux*R4*   | i586-dg-dgux5.4.4* ) machine=aviion opsys=dgux5-4r4 ;;
   m88k-dg-dgux5.4R3* | m88k-dg-dgux5.4.3* ) opsys=dgux5-4r3 ;;
   m88k-dg-dgux5.4R2* | m88k-dg-dgux5.4.2* ) opsys=dgux5-4r2 ;;