Trying to compile www-client/chromium-42.0.2311.90::gentoo fails with the following error: In file included from ../../chrome/browser/password_manager/password_store_factory.cc:44:0: ../../chrome/browser/password_manager/native_backend_libsecret.h:26:20: error: ‘::secret_service_search_sync’ has not been declared static decltype(&::secret_service_search_sync) secret_service_search_sync; ^ ../../chrome/browser/password_manager/native_backend_libsecret.h:28:20: error: ‘::secret_item_get_secret’ has not been declared static decltype(&::secret_item_get_secret) secret_item_get_secret; ^ ../../chrome/browser/password_manager/native_backend_libsecret.h:29:20: error: ‘::secret_value_get_text’ has not been declared static decltype(&::secret_value_get_text) secret_value_get_text; ^ ../../chrome/browser/password_manager/native_backend_libsecret.h:30:20: error: ‘::secret_item_get_attributes’ has not been declared static decltype(&::secret_item_get_attributes) secret_item_get_attributes; ^ ../../chrome/browser/password_manager/native_backend_libsecret.h:31:20: error: ‘::secret_item_load_secret_sync’ has not been declared static decltype(&::secret_item_load_secret_sync) secret_item_load_secret_sync; ^ ../../chrome/browser/password_manager/native_backend_libsecret.h:32:20: error: ‘::secret_value_unref’ has not been declared static decltype(&::secret_value_unref) secret_value_unref; ^ The active version of libsecret on the machine is 0.16. A unmasked version of libsecret 0.18 is available Reproducible: Always $ emerge --info Portage 2.2.18 (python 2.7.9-final-0, default/linux/amd64/13.0/desktop, gcc-4.8.3, glibc-2.19-r1, 3.18.3-aufs x86_64) ================================================================= System uname: Linux-3.18.3-aufs-x86_64-Intel-R-_Core-TM-2_Quad_CPU_Q8400_@_2.66GHz-with-gentoo-2.2 KiB Mem: 3988136 total, 1415760 free KiB Swap: 2097148 total, 1994416 free Timestamp of repository gentoo: Thu, 07 May 2015 12:45:01 +0000 sh dash 0.5.7.1 ld GNU ld (Gentoo 2.24 p1.4) 2.24 app-shells/bash: 4.2_p53::gentoo dev-java/java-config: 2.2.0::gentoo dev-lang/perl: 5.20.2::gentoo dev-lang/python: 2.7.9-r1::gentoo, 3.3.5-r1::gentoo, 3.4.1::gentoo dev-util/cmake: 2.8.12.2-r1::gentoo dev-util/pkgconfig: 0.28-r1::gentoo sys-apps/baselayout: 2.2::gentoo sys-apps/openrc: 0.13.11::gentoo sys-apps/sandbox: 2.6-r1::gentoo sys-devel/autoconf: 2.13::gentoo, 2.69::gentoo sys-devel/automake: 1.11.6::gentoo, 1.12.6::gentoo, 1.13.4::gentoo sys-devel/binutils: 2.24-r3::gentoo sys-devel/gcc: 4.6.3::gentoo, 4.7.3-r1::gentoo, 4.8.3::gentoo sys-devel/gcc-config: 1.7.3::gentoo sys-devel/libtool: 2.4.2-r1::gentoo sys-devel/make: 3.82-r4::gentoo sys-kernel/linux-headers: 3.18::gentoo (virtual/os-headers) sys-libs/glibc: 2.19-r1::gentoo Repositories: gentoo location: /usr/portage sync-type: rsync sync-uri: rsync://rsync.de.gentoo.org/gentoo-portage priority: -1000 mine location: /var/lib/layman/mine masters: gentoo priority: 0 ACCEPT_KEYWORDS="amd64" ACCEPT_LICENSE="* -@EULA" CBUILD="x86_64-pc-linux-gnu" CFLAGS="-O2 -pipe -march=core2" CHOST="x86_64-pc-linux-gnu" CONFIG_PROTECT="/etc /usr/lib64/libreoffice/program/sofficerc /usr/share/config /usr/share/gnupg/qualified.txt /usr/share/maven-bin-3.0/conf /usr/share/maven-bin-3.1/conf /var/lib/hsqldb" CONFIG_PROTECT_MASK="/etc/ca-certificates.conf /etc/dconf /etc/env.d /etc/fonts/fonts.conf /etc/gconf /etc/gentoo-release /etc/php/apache2-php5.5/ext-active/ /etc/php/cgi-php5.5/ext-active/ /etc/php/cli-php5.5/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 -pipe -march=core2" DISTDIR="/usr/portage/distfiles" 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 userpriv usersandbox usersync" FFLAGS="-O2 -pipe" GENTOO_MIRRORS="http://gentoo.mirrors.hoobly.com/ ftp://mirror.netcologne.de/gentoo/ rsync://mirror.netcologne.de/gentoo/ ftp://gentoo.imj.fr/pub/gentoo/ ftp://gentoo.bloodhost.ru/ rsync://mirror.leaseweb.com/gentoo/" LC_ALL="en_US.UTF-8" LDFLAGS="-Wl,-O1 -Wl,--as-needed" MAKEOPTS="-j4" 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="/home2/tmp/portage" USE="X a52 aac acl acpi alsa amd64 amr amrnb amrwb asf bash-completion berkdb bluetooth branding bzip2 cairo cdda cdr cli cracklib crypt cups cxx dbus dri dts dvd dvdr emboss encode exif fam firefox flac fortran gdbm gif glamor gpm gtk iconv idn ipv6 jpeg jpeg2k lcms ldap libdvd libnotify mmx mmxext mng modules mp3 mp4 mpeg multilib ncurses nls nptl ogg opengl openmp pam pango pcre pdf png policykit ppds pulseaudio qt3support qt4 readline resolvconf sdl session spell sse sse2 ssl startup-notification svg systemd tcpd theora tiff truetype udev udisks unicode upower usb vim-syntax vorbis wxwidgets x264 xcb xml xv xvid 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" CPU_FLAGS_X86="mmx mmx2 mmxext sse sse2 sse3 ssse3" 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 keyboard mouse" KERNEL="linux" LCD_DEVICES="bayrad cfontz cfontz633 glk hd44780 lb216 lcdm001 mtxorb ncurses text" LIBREOFFICE_EXTENSIONS="presenter-console presenter-minimizer" OFFICE_IMPLEMENTATION="libreoffice" PHP_TARGETS="php5-5" PYTHON_SINGLE_TARGET="python2_7" PYTHON_TARGETS="python2_7 python3_4" RUBY_TARGETS="ruby19 ruby20" USERLAND="GNU" VIDEO_CARDS="intel i810 radeon" 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" Unset: CPPFLAGS, CTARGET, EMERGE_DEFAULT_OPTS, INSTALL_MASK, LANG, PORTAGE_BUNZIP2_COMMAND, PORTAGE_COMPRESS, PORTAGE_COMPRESS_FLAGS, PORTAGE_RSYNC_EXTRA_OPTS
www-client/chromium-42.0.2311.90 no longer exists in the portage tree.
Reemerging chromium after upgrading to libsecret 0.18 solves the problem. I believe this dependency on a particular/minimum version should be enforced in the chromium ebuild. This might be an issue affecting future release as well.
I suggest you sync your tree and read the ChangeLog.