如何得知自己的电脑支持哪些USE flags?

gnu_bentoo

最近在emerge mplayer时，看到如下信息：

1. Setting MPlayer messages to language: zh_CN
   
2. * Your system is 3dnowext capable but you don't have it enabled!
   
3. * You might be cross compiling (in this case set CROSSCOMPILE to 1 to disable this warning.
   
4. * Your system is sse capable but you don't have it enabled!
   
5. * You might be cross compiling (in this case set CROSSCOMPILE to 1 to disable this warning.
   
6. * Your system is mmxext capable but you don't have it enabled!
   
7. * You might be cross compiling (in this case set CROSSCOMPILE to 1 to disable this warnin
   

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请问如何知道自己的电脑支持哪些USE flags?谢谢！

linuxth

# emerge -pv mplayer

These are the packages that I would merge, in order:

Calculating dependencies ...done!
[ebuild   R   ] media-video/mplayer-1.0_pre6-r5  -3dfx -3dnow -3dnowext +X -aalib +alsa (-altivec) +arts +avi -bidi -bl -cdparanoia -debug -dga -directfb -divx4linux* -doc -dts -dv -dvb +dvd -dvdread -edl +encode +esd -fbcon -ggi +gif +gtk -i8x0 -ipv6 -jack -joystick +jpeg -libcaca -lirc -live -lzo +mad -matroska -matrox +mmx -mmxext +mpeg -mythtv -nas +nls -nvidia +oggvorbis +opengl +oss +png +real -rtc -samba +sdl +sse +sse2 +svga -tga -theora +truetype -v4l -v4l2 -xanim -xinerama +xmms +xv -xvid -xvmc 7,144 kB

Total size of downloads: 7,144 kB

如intel cpu可以打开 sse sse2 mmx支持，根据自己硬件作相应的改动。