diff -ur linux-109/mm/mmap.c linux/mm/mmap.c
--- linux-109/mm/mmap.c	Fri Feb  4 20:59:35 1994
+++ linux/mm/mmap.c	Sun Feb 15 19:01:55 1998
@@ -229,7 +236,11 @@
 
 asmlinkage int sys_mprotect(unsigned long addr, size_t len, unsigned long prot)
 {
-	return -EINVAL; /* Not implemented yet */
+	/* 
+	 *  Not implemented here, but lie and return zero to fake success
+	 *  and be like the newer kernels 
+	 */
+	return 0;
 }
 
 asmlinkage int sys_munmap(unsigned long addr, size_t len)