diff -Naur i2c-2.8.0/kernel/i2c-velleman.c i2c-2.8.0-velleman/kernel/i2c-velleman.c
--- i2c-2.8.0/kernel/i2c-velleman.c	2003-01-21 04:00:19.000000000 -0600
+++ i2c-2.8.0-velleman/kernel/i2c-velleman.c	2003-07-26 20:43:31.000000000 -0500
@@ -29,6 +29,7 @@
 #include "i2c.h"
 #include "i2c-algo-bit.h"
 #include <asm/io.h>
+#include <asm/param.h>	/* for HZ */
 
 /* ----- global defines -----------------------------------------------	*/
 #define DEB(x)		/* should be reasonable open, close &c. 	*/
diff -Naur i2c-2.8.0/kernel/i2c-elektor.c i2c-2.8.0-elektor/kernel/i2c-elektor.c
--- i2c-2.8.0/kernel/i2c-elektor.c	2003-01-21 04:00:19.000000000 -0600
+++ i2c-2.8.0-elektor/kernel/i2c-elektor.c	2003-07-26 15:45:51.000000000 -0500
@@ -63,6 +63,16 @@
 #define DEB3(x) if (i2c_debug>=3) x
 #define DEBE(x)	x	/* error messages 				*/
 
+
+/* compatibility */
+#ifndef isa_readb
+#define isa_readb readb
+#endif
+
+#ifndef isa_writeb
+#define isa_writeb writeb
+#endif
+
 /* ----- local functions ----------------------------------------------	*/
 
 static void pcf_isa_setbyte(void *data, int ctl, int val)
@@ -82,10 +92,10 @@
 		break;
 	case 2: /* double mapped I/O needed for UP2000 board,
                    I don't know why this... */
-		writeb(val, address);
+		isa_writeb(val, address);
 		/* fall */
 	case 1: /* memory mapped I/O */
-		writeb(val, address);
+		isa_writeb(val, address);
 		break;
 	}
 }
@@ -93,7 +103,7 @@
 static int pcf_isa_getbyte(void *data, int ctl)
 {
 	int address = ctl ? (base + 1) : base;
-	int val = mmapped ? readb(address) : inb(address);
+	int val = mmapped ? isa_readb(address) : inb(address);
 
 	DEB3(printk(KERN_DEBUG "i2c-elektor.o: Read 0x%X 0x%02X\n", address, val));