$ equery u mplayer
+X
+a52
-aalib
+alsa
-bidi
-bl
-bluray
-bs2b
-cddb
+cdio
-cdparanoia
+cpu_flags_x86_3dnow
+cpu_flags_x86_3dnowext
+cpu_flags_x86_mmx
+cpu_flags_x86_mmxext
+cpu_flags_x86_sse
+cpu_flags_x86_sse2
+cpu_flags_x86_ssse3
-cpudetection
-debug
-dga
-doc
+dts
-dv
-dvb
+dvd
+dvdnav
+enca
+encode
-faac
-faad
+fbcon
-ftp
-ggi
+gif
-gsm
+iconv
+ipv6
-jack
-joystick
+jpeg
-ladspa
+libass
-libcaca
-libmpeg2
-lirc
-live
-lzo
+mad
-md5sum
+mng
+mp3
-nas
+network
-nut
-openal
+opengl
+osdmenu
-oss
+png
-pnm
-pulseaudio
-pvr
-radio
-rar
-rtc
-rtmp
-samba
+sdl
+shm
-speex
-tga
-theora
-toolame
-tremor
+truetype
-twolame
+unicode
-v4l
-vcd
-vdpau
-video_cards_mga
+vorbis
+x264
-xinerama
+xscreensaver
+xv
+xvid
+xvmc
+yuv4mpeg
+zoran