When trying to emerge ffmpeg with USE=aac, I get the following: These are the packages that I would merge, in reverse order: Calculating dependencies \ emerge: there are no ebuilds to satisfy "media-libs/libmp4v2". (dependency required by "media-libs/faad2-2.0-r9" [ebuild]) If I USE=-aac, it proceeds as normal. Portage 2.1_pre1 (!/usr/portage/profiles/default-linux/x86/2005.0, gcc-3.4.4, glibc-2.3.5-r3, 2.6.12-gentoo-r4 i686) ================================================================= System uname: 2.6.12-gentoo-r4 i686 Intel(R) Pentium(R) M processor 2.00GHz Gentoo Base System version 1.12.0_pre11 ccache version 2.3 [enabled] dev-lang/python: 2.3.5-r2, 2.4.2 sys-apps/sandbox: 1.2.17 sys-devel/autoconf: 2.13, 2.59-r7 sys-devel/automake: 1.4_p6, 1.5, 1.6.3, 1.7.9-r1, 1.8.5-r3, 1.9.6-r1 sys-devel/binutils: 2.16.1-r1 sys-devel/libtool: 1.5.20-r1 virtual/os-headers: 2.6.11-r3 ACCEPT_KEYWORDS="x86 ~x86" AUTOCLEAN="yes" CBUILD="i686-pc-linux-gnu" CFLAGS="-O2 -march=pentium-m -fomit-frame-pointer -pipe" CHOST="i686-pc-linux-gnu" CONFIG_PROTECT="/etc /opt/jetty/etc /opt/openjms/config /usr/kde/2/share/config /usr/kde/3.3/env /usr/kde/3.3/share/config /usr/kde/3.3/shutdown /usr/kde/3.4/env /usr/kde/3.4/share/config /usr/kde/3.4/shutdown /usr/kde/3/share/config /usr/lib/X11/xkb /usr/lib/mozilla/defaults/pref /usr/share/config /usr/share/texmf/dvipdfm/config/ /usr/share/texmf/dvips/config/ /usr/share/texmf/tex/generic/config/ /usr/share/texmf/tex/platex/config/ /usr/share/texmf/xdvi/ /var/qmail/control" CONFIG_PROTECT_MASK="/etc/gconf /etc/splash /etc/terminfo /etc/env.d" CXXFLAGS="-O2 -march=pentium-m -fomit-frame-pointer -pipe" DISTDIR="/usr/portage/distfiles" FEATURES="autoaddcvs autoconfig ccache cvs digest distlocks fixpackages sandbox sfperms sign strict userpriv usersandbox" GENTOO_MIRRORS="http://mirrors.acm.cs.rpi.edu/gentoo" MAKEOPTS="-j2" PKGDIR="/usr/portage/packages" PORTAGE_TMPDIR="/var/tmp" PORTDIR="/usr/gentoo-x86" PORTDIR_OVERLAY="/usr/local/overlays/gentoo-java-experimental /usr/local/overlays/free-java-overlay /usr/local/overlays/staging" SYNC="cvs://nichoj@cvs.gentoo.org:/var/cvsroot" USE="x86 X acpi alsa apache2 apm audiofile avi bash-completion berkdb bitmap-fonts bluetooth bonobo bzip2 cairo cdr crypt cups curl divx4linux dvd dvdr eds emboss encode ethereal exif expat faad fam ffmpeg firebird flac foomaticdb fortran gd gdbm gif gimp gimpprint glitz glut gmp gnome gphoto2 gpm gstreamer gtk gtk2 gtkhtml gtksharp guile hal howl idn imagemagick imlib ipv6 ithreads java javamail jce jikes jms jpeg junit lcms ldap libg++ libwww mad mhash mikmod mmx mng mono mozilla mp3 mpeg mysql ncurses nls nptl ogg oggvorbis openal opengl pam pcmcia pcre pda pdflib perl pic png postgres ppds python quicktime readline real recode ruby samba scanner sdl slang sox spell sqlite sse sse2 ssl subversion tcltk tcpd tetex tiff truetype truetype-fonts type1-fonts udev usb vorbis win32codecs xine xml xml2 xv xvid zlib elibc_glibc kernel_linux userland_GNU" Unset: ASFLAGS, CTARGET, LANG, LC_ALL, LDFLAGS, LINGUAS
emerge sync, the ebuild is definitely there...