改了make.conf，运行emerge xorg-x11也不行了，是不是要删掉原来的再重新编译一次？怎么删？

就是一开始make.conf忘了加上显卡和键盘鼠标的选项，结果现在这三样没装上。现在把make.conf改过来了

CHOST="i686-pc-linux-gnu"
CFLAGS="-march=pentium3 -O3 -pipe -fomit-frame-pointer"
CXXFLAGS="-march=pentium3 -O3 -pipe -fomit-frame-pointer"
MAKEOPTS="-j2"
LDFLAGS="-Wl,-O1"
ACCEPT_KEYWORDS="~x86"
USE=" X alsa arts avi berkdb bitmap-fonts cairo cdr cli crypt cups dbus dlloader dri dvd dvdr eds elibc_glibc emboss encode esd fam firefox fortran gdbm gif jpg gnome gpm gstreamer gtk hal input_devices_evdev input_devices_keyboard input_devices_mouse -ipv6 isdnlog jpeg kde kernel_linux ldap libg++ mad mikmod mp3 mpeg ncurses nls nptl nptlonly ogg opengl oss pam pcre pdflib perl png ppds pppd python qt3 -qt4 -quicktime readline reflection sdl session spell spl ssl tcpd truetype truetype-fonts type1-fonts udev unicode userland_GNU vorbis win32codecs x86 xml xorg xv zlib"
FEATURES="parallel-fetch"
LINGUAS="zh_CN"
GENTOO_MIRRORS="ftp://ftp.linuxforum.net/gentoo/ http://61.135.158.199 http://mirror.gentoo.gr.jp"
INPUT_DEVICES="keyboard mouse"
VIDEO_CARDS="nvidia"

但是emerge xorg-x11之后提示这个，就退出来了。

Calculating dependencies   ... done!
>>> Emerging (1 of 1) x11-base/xorg-x11-7.1 to /
>>> checking ebuild checksums ;-)
>>> checking auxfile checksums ;-)
>>> checking miscfile checksums ;-)
>>> Unpacking source...
>>> Source unpacked.
>>> Compiling source in /var/tmp/portage/xorg-x11-7.1 ...
>>> Source compiled.
>>> Test phase [not enabled]: x11-base/xorg-x11-7.1

>>> Install xorg-x11-7.1 into /var/tmp/portage/xorg-x11-7.1/image/ category x11-base
>>> Completed installing xorg-x11-7.1 into /var/tmp/portage/xorg-x11-7.1/image/

man:
>>> Merging x11-base/xorg-x11-7.1 to /
--- /usr/
>>> /usr/X11R6 -> ../usr
--- /etc/
--- /etc/X11/
>>> /etc/X11/xorg.conf
>>> Safely unmerging already-installed instance...
--- !mtime sym /usr/X11R6
--- cfgpro obj /etc/X11/xorg.conf
--- cfgpro dir /etc/X11
--- !empty dir /usr
--- !empty dir /etc
>>> Original instance of package unmerged safely.

 Please note that the xcursors are in /usr/share/cursors/xorg-x11.
 Any custom cursor sets should be placed in that directory.

If you wish to set system-wide default cursors, please create
 /usr/local/share/cursors/xorg-x11/default/index.theme
with content: "Inherits=theme_name" so that future
emerges will not overwrite those settings.

Listening on TCP is disabled by default with startx.
To enable it, edit /usr/bin/startx.

Please read the modular X migration guide at
 http://www.gentoo.org/proj/en/desktop/x/x11/modular-x-howto.xml

If you encounter any non-configuration issues, please file a bug at
http://bugs.gentoo.org/enter_bug.cgi?product=Gentoo%20Linux
and attach /etc/X11/xorg.conf, /var/log/Xorg.0.log and emerge info

You can now choose which drivers are installed with the VIDEO_CARDS and INPUT_DEVICES settings. Set these like any other Portage
variable in /etc/make.conf or on the command line.

Visit http://www.gentoo.org/doc/en/index.xml?catid=desktop
for more information on configuring X.

>>> x11-base/xorg-x11-7.1 merged.

>>> No packages selected for removal by clean.

>>> Auto-cleaning packages...

>>> No outdated packages were found on your system.


 * GNU info directory index is up-to-date.
 * IMPORTANT: 1 config files in /etc need updating.
 * Type emerge --help config to learn how to update config files.

不行，etc-update后也不能启动X，我确定是那三个驱动模块没装进去。