emerge --info audacity

Portage 2.2.7 (default/linux/amd64/13.0/desktop/kde, gcc-4.6.3, glibc-2.17, 3.12.5-ck x86_64)
=================================================================
                        System Settings
=================================================================
System uname: Linux-3.12.5-ck-x86_64-Intel-R-_Core-TM-2_Duo_CPU_P7350_@_2.00GHz-with-gentoo-2.2
KiB Mem:     4014096 total,   1009240 free
KiB Swap:    4227068 total,   4227068 free
Timestamp of tree: Mon, 10 Feb 2014 14:00:01 +0000
ld GNU ld (GNU Binutils) 2.23.2
ccache version 3.1.9 [enabled]
app-shells/bash:          4.2_p45
dev-java/java-config:     2.1.12-r1
dev-lang/python:          2.7.5-r3, 3.2.5-r3, 3.3.3
dev-util/ccache:          3.1.9-r3
dev-util/cmake:           2.8.11.2
dev-util/pkgconfig:       0.28
sys-apps/baselayout:      2.2
sys-apps/openrc:          0.12.4
sys-apps/sandbox:         2.6-r1
sys-devel/autoconf:       2.13, 2.69
sys-devel/automake:       1.11.6, 1.12.6, 1.13.4
sys-devel/binutils:       2.23.2
sys-devel/gcc:            4.6.3, 4.7.3-r1
sys-devel/gcc-config:     1.7.3
sys-devel/libtool:        2.4.2
sys-devel/make:           3.82-r4
sys-kernel/linux-headers: 3.9 (virtual/os-headers)
sys-libs/glibc:           2.17
Repositories: gentoo powerman sabayon sunrise proaudio hyperion
ACCEPT_KEYWORDS="amd64"
ACCEPT_LICENSE="* -@EULA AdobeFlash-11.x FraunhoferFDK google-chrome LGPL-2.1+ Nero-AAC-EULA Nero-EULA-US OFL-1.1 PUEL skype-4.0.0.7-copyright"
CBUILD="x86_64-pc-linux-gnu"
CFLAGS="-O2 -march=native -pipe -fomit-frame-pointer"
CHOST="x86_64-pc-linux-gnu"
CONFIG_PROTECT="/etc /usr/share/config /usr/share/gnupg/qualified.txt /usr/share/themes/oxygen-gtk/gtk-2.0"
CONFIG_PROTECT_MASK="/etc/ca-certificates.conf /etc/env.d /etc/fonts/fonts.conf /etc/gconf /etc/gentoo-release /etc/revdep-rebuild /etc/sandbox.d /etc/terminfo"
CXXFLAGS="-O2 -march=native -pipe -fomit-frame-pointer"
DISTDIR="/usr/portage/distfiles"
FCFLAGS="-O2 -pipe"
FEATURES="assume-digests binpkg-logs candy ccache config-protect-if-modified distlocks ebuild-locks fixlafiles merge-sync news parallel-fetch preserve-libs protect-owned sandbox sfperms strict unknown-features-warn unmerge-logs unmerge-orphans userfetch userpriv usersandbox usersync"
FFLAGS="-O2 -pipe"
GENTOO_MIRRORS="http://distfiles.gentoo.org"
LANG="en_GB.UTF-8"
LDFLAGS="-Wl,-O1 -Wl,--as-needed"
MAKEOPTS="-j2"
PKGDIR="/usr/portage/packages"
PORTAGE_CONFIGROOT="/"
PORTAGE_RSYNC_OPTS="--recursive --links --safe-links --perms --times --omit-dir-times --compress --force --whole-file --delete --stats --human-readable --timeout=180 --exclude=/distfiles --exclude=/local --exclude=/packages"
PORTAGE_TMPDIR="/var/tmp"
PORTDIR="/usr/portage"
PORTDIR_OVERLAY="/var/lib/layman/powerman /var/lib/layman/sabayon /var/lib/layman/sunrise /var/lib/layman/pro-audio /home/gentoo/overlay"
USE="X a52 aac aacplus acl acpi alsa amd64 ape berkdb bluetooth branding bzip2 cairo cdda cddb cdparanoia cdr cli consolekit cracklib crypt css curl cvs cxx dbus declarative directfb djvu dri dts dvd dvdr ebook emboss encode equalizer exif faac faad fam ffmpeg firefox flac fluidsynth fontconfig fortran gbm gdbm gif gimp git gles1 gles2 gpm gsm gstreamer gtk gudev gzip hwdb iconv icu ipv6 jack java jpeg jpeg2k kde kipi ladspa lame lcms ldap libmpeg2 libnotify libsamplerate lzma mad matroska md5sum minizip mmx mmxext mng modemmanager modules mozilla mp3 mp4 mpeg mplayer multilib musepack mysql ncurses networkmanager nls nptl ntfsprogs ogg openal opengl openmp openrc openvg pam pango pcre pdf perl phonon php plasma png policykit ppds pulseaudio python qt3support qt4 rar readline ruby sdl semantic-desktop session shn sndfile source speex spell sql sqlite sse sse2 sse3 ssl ssse3 startup-notification subversion svg system-cairo system-icu system-jpeg system-sqlite tcl tcpd theora threads tiff tk toolame truetype twolame udev udisks unicode upower usb v4l vdpau vorbis wavpack wifi wxwidgets x264 xcb xcomposite xinerama xml xscreensaver xv xvid zeroconf zip zlib" ABI_X86="64" ALSA_CARDS="ali5451 als4000 atiixp atiixp-modem bt87x ca0106 cmipci emu10k1x ens1370 ens1371 es1938 es1968 fm801 hda-intel intel8x0 intel8x0m maestro3 trident usb-audio via82xx via82xx-modem ymfpci" APACHE2_MODULES="authn_core authz_core socache_shmcb unixd actions alias auth_basic authn_alias authn_anon authn_dbm authn_default authn_file authz_dbm authz_default authz_groupfile authz_host authz_owner authz_user autoindex cache cgi cgid dav dav_fs dav_lock deflate dir disk_cache env expires ext_filter file_cache filter headers include info log_config logio mem_cache mime mime_magic negotiation rewrite setenvif speling status unique_id userdir usertrack vhost_alias" CALLIGRA_FEATURES="kexi words flow plan sheets stage tables krita karbon braindump author" CAMERAS="ptp2" COLLECTD_PLUGINS="df interface irq load memory rrdtool swap syslog" ELIBC="glibc" GPSD_PROTOCOLS="ashtech aivdm earthmate evermore fv18 garmin garmintxt gpsclock itrax mtk3301 nmea ntrip navcom oceanserver oldstyle oncore rtcm104v2 rtcm104v3 sirf superstar2 timing tsip tripmate tnt ublox ubx" INPUT_DEVICES="evdev synaptics" KERNEL="linux" LCD_DEVICES="bayrad cfontz cfontz633 glk hd44780 lb216 lcdm001 mtxorb ncurses text" LIBREOFFICE_EXTENSIONS="presenter-console presenter-minimizer" LINGUAS="en_GB" NETBEANS_MODULES="apisupport java javafx profiler websvccommon cnd dlight groovy javacard mobility php webcommon" OFFICE_IMPLEMENTATION="libreoffice" PHP_TARGETS="php5-5" PYTHON_SINGLE_TARGET="python2_7" PYTHON_TARGETS="python2_7 python3_2" RUBY_TARGETS="ruby19" USERLAND="GNU" VIDEO_CARDS="nvidia" XTABLES_ADDONS="quota2 psd pknock lscan length2 ipv4options ipset ipp2p iface geoip fuzzy condition tee tarpit sysrq steal rawnat logmark ipmark dhcpmac delude chaos account"
USE_PYTHON="2.7 3.2"
Unset:  CPPFLAGS, CTARGET, EMERGE_DEFAULT_OPTS, INSTALL_MASK, LC_ALL, PORTAGE_BUNZIP2_COMMAND, PORTAGE_COMPRESS, PORTAGE_COMPRESS_FLAGS, PORTAGE_RSYNC_EXTRA_OPTS, SYNC

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                        Package Settings
=================================================================

media-sound/audacity-2.0.5 was built with the following:
USE="alsa flac jack ladspa libsamplerate libsoxr mp3 twolame vorbis (-ffmpeg) -id3tag -midi -sbsms -soundtouch -vamp"