diff -Nru linux-user/syscall.c linux-user/syscall.c
--- linux-user/syscall.c	2005-03-23 10:56:59.000000000 +0200
+++ linux-user/syscall.c	2005-03-23 11:22:58.000000000 +0200
@@ -2894,7 +2894,8 @@
 #endif
 #ifdef TARGET_NR_truncate64
     case TARGET_NR_truncate64:
-        goto unimplemented;
+	ret = get_errno(truncate64((const char *)arg1, arg2));
+	break;
 #endif
 #ifdef TARGET_NR_ftruncate64
     case TARGET_NR_ftruncate64: