Two libraries are in conflict: dev-libs/jsoncpp and dev-libs/json-c Reproducible: Always Steps to Reproduce: 1. emerge -pv chromium Actual Results: ebuild N ~] dev-libs/re2-0_p20121127 996 kB [ebuild N ~] dev-libs/jsoncpp-0.5.0 USE="-doc" 105 kB [ebuild U #] dev-lang/v8-3.16.11.1:0/3.16.11 [3.15.11.2:0/3.15.11] 10,178 kB [ebuild U #] www-client/chromium-26.0.1403.0 [25.0.1364.58] USE="cups -bindist -custom-cflags -gnome -gnome-keyring -gps% -kerberos (-pulseaudio) (-selinux) (-system-ffmpeg) (-tcmalloc) {-test}" LINGUAS="ru -am -ar -bg -bn -ca -cs -da -de -el -en_GB -es -es_LA -et -fa -fi -fil -fr -gu -he -hi -hr -hu -id -it -ja -kn -ko -lt -lv -ml -mr -ms -nb -nl -pl -pt_BR -pt_PT -ro -sk -sl -sr -sv -sw -ta -te -th -tr -uk -vi -zh_CN -zh_TW" 137,205 kB [blocks B ] <dev-libs/json-c-0.10 ("<dev-libs/json-c-0.10" is blocking dev-libs/jsoncpp-0.5.0) [blocks B ] dev-libs/jsoncpp ("dev-libs/jsoncpp" is blocking dev-libs/json-c-0.9-r1) Total: 4 packages (2 upgrades, 2 new), Size of downloads: 148,483 kB Conflict: 2 blocks (2 unsatisfied) * Error: The above package list contains packages which cannot be * installed at the same time on the same system. (dev-libs/jsoncpp-0.5.0::gentoo, ebuild scheduled for merge) pulled in by dev-libs/jsoncpp required by (www-client/chromium-26.0.1403.0::gentoo, ebuild scheduled for merge) (dev-libs/json-c-0.9-r1::gentoo, installed) pulled in by dev-libs/json-c required by (media-sound/pulseaudio-3.0::gentoo, installed) Portage 2.2.0_alpha163 (default/linux/amd64/13.0/desktop, gcc-4.6.3, glibc-2.15-r3, 3.7.6-gentoo x86_64) ================================================================= System uname: Linux-3.7.6-gentoo-x86_64-Intel-R-_Core-TM-_i7-3632QM_CPU_@_2.20GHz-with-gentoo-2.2 KiB Mem: 16321660 total, 3009412 free KiB Swap: 4194300 total, 4194300 free Timestamp of tree: Mon, 18 Feb 2013 12:00:01 +0000 ld GNU ld (GNU Binutils) 2.22 app-shells/bash: 4.2_p37 dev-java/java-config: 2.1.12-r1 dev-lang/python: 2.7.3-r2, 3.2.3 dev-util/cmake: 2.8.9 dev-util/pkgconfig: 0.28 sys-apps/baselayout: 2.2 sys-apps/openrc: 0.11.8 sys-apps/sandbox: 2.5 sys-devel/autoconf: 2.13, 2.69 sys-devel/automake: 1.9.6-r3, 1.11.6 sys-devel/binutils: 2.22-r1 sys-devel/gcc: 4.6.3 sys-devel/gcc-config: 1.7.3 sys-devel/libtool: 2.4-r1 sys-devel/make: 3.82-r4 sys-kernel/linux-headers: 3.6 (virtual/os-headers) sys-libs/glibc: 2.15-r3 Repositories: gentoo gamerlay games multimedia seden x-port ACCEPT_KEYWORDS="amd64" ACCEPT_LICENSE="*" CBUILD="x86_64-pc-linux-gnu" CFLAGS="-O2 -march=native -mtune=native -pipe" CHOST="x86_64-pc-linux-gnu" CONFIG_PROTECT="/etc /usr/share/config /usr/share/gnupg/qualified.txt /usr/share/polkit-1/actions /usr/share/themes/oxygen-gtk/gtk-2.0" CONFIG_PROTECT_MASK="${EPREFIX}/etc/gconf /etc/ca-certificates.conf /etc/env.d /etc/fonts/fonts.conf /etc/gconf /etc/gentoo-release /etc/php/apache2-php5.4/ext-active/ /etc/php/cgi-php5.4/ext-active/ /etc/php/cli-php5.4/ext-active/ /etc/revdep-rebuild /etc/sandbox.d /etc/terminfo /etc/texmf/language.dat.d /etc/texmf/language.def.d /etc/texmf/updmap.d /etc/texmf/web2c" CXXFLAGS="-O2 -march=native -mtune=native -pipe" DISTDIR="/usr/portage/distfiles" EMERGE_DEFAULT_OPTS="--jobs=8 --autounmask=y --autounmask-write=y --quiet-build=y --deep --with-bdeps=y" FCFLAGS="-O2 -pipe" FEATURES="assume-digests binpkg-logs 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" FFLAGS="-O2 -pipe" GENTOO_MIRRORS="ftp://mirror.yandex.ru/gentoo-distfiles/ rsync://gentoo.kiev.ua/gentoo-distfiles ftp://gentoo.kiev.ua/ http://gentoo.iteam.net.ua/ ftp://portage.org.ua/ rsync://gentoo.mirrors.tds.net/gentoo rsync://gentoo.cs.uni.edu/gentoo-distfiles ftp://chi-10g-1-mirror.fastsoft.net/pub/linux/gentoo/gentoo-distfiles/ ftp://ftp.gtlib.gatech.edu/pub/gentoo ftp://gentoo.mirrors.tds.net/gentoo" LANG="ru_RU.UTF8" LDFLAGS="-Wl,-O1 -Wl,--as-needed" MAKEOPTS="-j8" PKGDIR="/usr/portage/packages" PORTAGE_CONFIGROOT="/" PORTAGE_RSYNC_OPTS="--recursive --links --safe-links --perms --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/gamerlay /var/lib/layman/games /var/lib/layman/multimedia /var/lib/layman/seden /home/mahmud/port" SYNC="rsync://rsync.gentoo.org/gentoo-portage" USE="X a52 aac accessibility acl acpi alsa amd64 berkdb bluetooth branding bzip2 cairo cdda cdr chm cli consolekit cracklib crypt crypto cryptsetup cups cxx dbus djvu dri dri2 dts dvd dvdr ebook emboss encode exif fam fbcondecor ffmpeg firefox flac fortran gdbm gif gpm iconv ipv6 jpeg jpeg2k kde kipi laptop lcms ldap libnotify lm_sensors lzma mad midi mmx mng modules mp3 mp4 mpeg mudflap multilib natspec ncurses nls nptl nsplugin ogg opengl openmp pam pango pcre pdf png policykit ppds pulseaudio qt3support qt4 raw readline sasl sdl semantic-desktop session sna spell sse sse2 sse3 sse4 sse4.1 ssl ssse3 startup-notification svg tcpd threads tiff truetype udev udisks unicode upower usb vorbis webkit wmf wxwidgets x264 xcb xine xinerama xml xv xvid 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" ALSA_PCM_PLUGINS="adpcm alaw asym copy dmix dshare dsnoop empty extplug file hooks iec958 ioplug ladspa lfloat linear meter mmap_emul mulaw multi null plug rate route share shm softvol" 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" 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 ubx" GRUB_PLATFORMS="emu efi-32 efi-64 pc" 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="ru" PHP_TARGETS="php5-3" PYTHON_SINGLE_TARGET="python2_7" PYTHON_TARGETS="python2_7 python3_2" RUBY_TARGETS="ruby18 ruby19" USERLAND="GNU" VIDEO_CARDS="intel" 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" Unset: CPPFLAGS, CTARGET, INSTALL_MASK, LC_ALL, PORTAGE_BUNZIP2_COMMAND, PORTAGE_COMPRESS, PORTAGE_COMPRESS_FLAGS, PORTAGE_RSYNC_EXTRA_OPTS, USE_PYTHON
Gentoo Forums :: json-c+pulsaudio vs. jsoncpp+chromium : http://forums.gentoo.org/viewtopic-p-7243186.html
Simply install dev-libs/json-c-0.10-r1.