VirtualBox最新虚拟机3.14无法安装增强插件？

[loaden@qpsoft VBOXADDITIONS_3.1.4_57640]$ sudo VBoxLinuxAdditions-x86.run 
密码：
sudo: VBoxLinuxAdditions-x86.run: command not found
[loaden@qpsoft VBOXADDITIONS_3.1.4_57640]$ sudo ./VBoxLinuxAdditions-x86.run 
Verifying archive integrity... All good.
Uncompressing VirtualBox 3.1.4 Guest Additions for Linux.........
VirtualBox Guest Additions installer
Removing installed version of VirtualBox Guest Additions...
tar: 记录大小 = 8 块
# Start vboxadd
if [ -x /etc/rc.d/rc.vboxadd ]; then
 /etc/rc.d/rc.vboxadd start
# Start vboxadd-service
if [ -x /etc/rc.d/rc.vboxadd-service ]; then
 /etc/rc.d/rc.vboxadd-service start
# Start vboxadd-x11
if [ -x /etc/rc.d/rc.vboxadd-x11 ]; then
 /etc/rc.d/rc.vboxadd-x11 start
:: Building the VirtualBox Guest Additions kernel modules [FAIL] 
(Your system does not seem to be set up to build kernel modules.
Look at /var/log/vboxadd-install.log to find out what went wrong)
# Start vboxadd-service
if [ -x /etc/rc.d/rc.vboxadd-service ]; then
 /etc/rc.d/rc.vboxadd-service start
# Start vboxadd-x11
if [ -x /etc/rc.d/rc.vboxadd-x11 ]; then
 /etc/rc.d/rc.vboxadd-x11 start
:: Installing the Window System drivers [BUSY] 
:: Installing experimental X.Org Server 1.7 modules [DONE] 
:: Setting up the Window System to use the Guest Additions [DONE] 
You may need to restart the hal service and the Window System (or just restart
the guest system) to enable the Guest Additions.

:: Installing graphics libraries and desktop services components [DONE]