gentoo Multiple package instances within a single package slot - требует невозможного

все USE флаги из make.conf в студию а еще
emerge x11-libs/cairo -pv 
emerge www-client/mozilla-firefox -pv
emerge net-libs/xulrunner -pv

# emerge --info | grep USE
USE="X acl alsa bash-completion berkdb bzip2 cdr cli cracklib crypt cups dbus dri flac fortran gdbm gpm hal hald iconv ipv6 isdnlog ithreads kde latex ldap mmx mmxext mp3 mudflap ncurses nls nptl nptlonly ogg opengl openmp pam pcre perl pppd python qt qt3 qt4 readline reflection samba session spell spl sse sse2 sse3 ssl ssse3 sysfs tcpd theora threads unicode userlocales utf8 vim-syntax vorbis x86 xine xorg zlib" ALSA_CARDS="ali5451 als4000 atiixp atiixp-modem bt87x ca0106 cmipci emu10k1 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="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 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" ELIBC="glibc" INPUT_DEVICES="keyboard mouse evdev" KERNEL="linux" LCD_DEVICES="bayrad cfontz cfontz633 glk hd44780 lb216 lcdm001 mtxorb ncurses text" LINGUAS="ru ru_RU en en_GB" USERLAND="GNU" VIDEO_CARDS="i128 i740 i810 intel"


$ emerge x11-libs/cairo -pv
[ebuild     UD] x11-libs/cairo-1.8.6-r1 [1.8.8] USE="X opengl svg -cleartype -debug -directfb -doc -glitz -xcb" 0 kB

$ emerge www-client/mozilla-firefox -pv
[ebuild   R   ] www-client/mozilla-firefox-3.5.2-r1  USE="alsa dbus -bindist -custom-optimization -gnome -iceweasel -java -mozdevelop -restrict-javascript -startup-notification" LINGUAS="en en_GB ru -af -ar -as -be -bg -bn -bn_BD -bn_IN -ca -cs -cy -da -de -el -en_US -eo -es -es_AR -es_CL -es_ES -es_MX -et -eu -fa -fi -fr -fy -fy_NL -ga -ga_IE -gl -gu -gu_IN -he -hi -hi_IN -hr -hu -id -is -it -ja -ka -kk -kn -ko -ku -lt -lv -mk -ml -mn -mr -nb -nb_NO -nl -nn -nn_NO -oc -or -pa -pa_IN -pl -pt -pt_BR -pt_PT -rm -ro -si -sk -sl -sq -sr -sv -sv_SE -ta -ta_LK -te -th -tr -uk -vi -zh_CN -zh_TW" 0 kB

$ emerge net-libs/xulrunner -pv
[ebuild     UD] net-libs/xulrunner-1.9.0.13 [1.9.1.2-r1] USE="dbus -custom-optimization -gnome -java -startup-notification (-alsa%*) (-debug%) (-python%*)" 33,601 kB

Уйопта... Дописал в /etc/portage/package.keywords пакет net-libs/xulrunner (чтоб он не даунгрейдился) и получил ещё менее адекватное сообщения от емерджа:

!!! Multiple package instances within a single package slot have been pulled
!!! into the dependency graph, resulting in a slot conflict:

x11-libs/cairo:0

  ('installed', '/', 'x11-libs/cairo-1.8.8', 'nomerge') pulled in by
    >=x11-libs/cairo-1.8.8[X] required by ('ebuild', '/', 'www-client/mozilla-firefox-3.5.2-r1', 'merge')
    >=x11-libs/cairo-1.8.8[X] required by ('ebuild', '/', 'net-libs/xulrunner-1.9.1.2-r1', 'merge')
    (and 3 more)

  ('ebuild', '/', 'x11-libs/cairo-1.8.6-r1', 'merge') pulled in by
    x11-libs/cairo
    >=x11-libs/cairo-1.6.0 required by ('ebuild', '/', 'net-libs/xulrunner-1.9.1.2-r1', 'merge')
    >=x11-libs/cairo-1.6.0 required by ('ebuild', '/', 'www-client/mozilla-firefox-3.5.2-r1', 'merge')

  Explanation:

    New USE for 'x11-libs/cairo:0' are incorrectly set. In order to solve
    this, adjust USE to satisfy '>=x11-libs/cairo-1.8.8[X]'.

Это что-то странное, у меня не наблюдается. Попробуй замаскировать <cairo-1.8.8 и покажи что будет.

Точно, это помогло, спасибо. Первая запись в моём package.mask...