diff --git a/arch/m68k/lib/cache.c b/arch/m68k/lib/cache.c
index 370ad40..a21fe32 100644
--- a/arch/m68k/lib/cache.c
+++ b/arch/m68k/lib/cache.c
@@ -8,6 +8,7 @@
 #include <cpu_func.h>
 #include <asm/immap.h>
 #include <asm/cache.h>
+#include <linux/errno.h>
 
 volatile int *cf_icache_status = (int *)ICACHE_STATUS;
 volatile int *cf_dcache_status = (int *)DCACHE_STATUS;
@@ -151,3 +152,8 @@
 {
 	/* An empty stub, real implementation should be in platform code */
 }
+
+int __weak pgprot_set_attrs(phys_addr_t addr, size_t size, enum pgprot_attrs perm)
+{
+	return -ENOSYS;
+}