diff -ru xlife.orig/data.h xlife/data.h
--- xlife.orig/data.h	Mon Nov 27 05:51:32 1995
+++ xlife/data.h	Wed Oct 15 12:12:31 2003
@@ -20,6 +20,9 @@
  * PERFORMANCE OF THIS SOFTWARE.
  */
 
+#include <errno.h>
+#include <string.h>
+
 /* file.c */
 GLOBAL void fileinit(void);
 GLOBAL void savefile(void);
@@ -84,9 +87,10 @@
 GLOBAL void setcolor(int val, unsigned long x, unsigned long y);
 
 /* UNIX interface */
-extern int sys_nerr, errno;
-extern char *sys_errlist[];
-#define SYSERR sys_errlist[(errno > sys_nerr? 0 : errno)]
+/* extern int sys_nerr, errno; */
+/* extern char *sys_errlist[]; */
+/* #define SYSERR sys_errlist[(errno > sys_nerr? 0 : errno)] */
+#define SYSERR strerror(errno)
 
 /* X I/O state information */
 GLOBAL Display *disp;
diff -ru xlife.orig/lifeconv.c xlife/lifeconv.c
--- xlife.orig/lifeconv.c	Tue Dec 29 04:32:45 1992
+++ xlife/lifeconv.c	Wed Oct 15 12:10:17 2003
@@ -126,7 +126,7 @@
     xmin = XMAX; ymin = YMAX; xmax = 0; ymax = 0;
     while (fgets(buf, BUFSIZ, ifp) != (char *)NULL)
     {
-	extern char	*strchr();
+	/* extern char	*strchr(); */
 
 	if (buf[0] == '#')
 	{