It is supposedly used for /usr/lib*/libgphoto2_port/0.10.0/ptpip.so. However, when -Wl,--as-needed is used the lib is removed. This needs further investigation, maybe wrong config.h is used for ptpip build...
I have this: $ equery files libgphoto2|grep ptpip /usr/lib64/libgphoto2_port/0.10.0/ptpip.la /usr/lib64/libgphoto2_port/0.10.0/ptpip.so and I am using default flags (that include as-needed from profiles): $ emerge --info libgphoto2 Portage 2.2.10 (default/linux/amd64/13.0/desktop/gnome/systemd, gcc-4.7.3, glibc-2.17, 3.14.3-gentoo x86_64) ================================================================= System Settings ================================================================= System uname: Linux-3.14.3-gentoo-x86_64-Intel-R-_Core-TM-_i7-3537U_CPU_@_2.00GHz-with-gentoo-2.2 KiB Mem: 8052620 total, 494332 free KiB Swap: 4607996 total, 4501244 free Timestamp of tree: Tue, 20 May 2014 19:30:01 +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: 2.2.0 dev-lang/python: 2.7.5-r3, 3.3.3 dev-util/ccache: 3.1.9-r3 dev-util/cmake: 2.8.12.2 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: 1.10.3, 1.11.6, 1.12.6, 1.13.4 sys-devel/binutils: 2.23.2 sys-devel/gcc: 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 x-portage ACCEPT_KEYWORDS="amd64" ACCEPT_LICENSE="*" CBUILD="x86_64-pc-linux-gnu" CFLAGS="-O2 -pipe -march=native" CHOST="x86_64-pc-linux-gnu" CONFIG_PROTECT="/etc /usr/share/gnupg/qualified.txt /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/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=native" DISTDIR="/usr/distfiles" EMERGE_DEFAULT_OPTS="--quiet-build=n --autounmask-write --keep-going" FCFLAGS="-O2 -pipe" FEATURES="assume-digests binpkg-logs ccache config-protect-if-modified distlocks ebuild-locks fixlafiles merge-sync multilib-strict news parallel-fetch preserve-libs protect-owned sandbox sfperms sign split-log strict test test-fail-continue unknown-features-warn unmerge-logs unmerge-orphans userfetch userpriv usersandbox usersync xattr" FFLAGS="-O2 -pipe" GENTOO_MIRRORS="http://ftp.heanet.ie/pub/gentoo/" LANG="es_ES.UTF-8" LDFLAGS="-Wl,-O1 -Wl,--as-needed -Wl,--hash-style=gnu" MAKEOPTS="-j5" PKGDIR="/usr/local/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="/usr/local/portage" USE="X a52 aac acl acpi alsa amd64 applet avx avx256 bash-completion berkdb bluetooth branding bzip2 cairo cdda cddb cdr cli colord cracklib crypt cups cvs cxx dbus djvu dri dts dvd dvdr dvi eds emboss enchant encode evo exif fam fat ffmpeg firefox flac fortran fuse gdbm gif gnome gnome-keyring gnome-online-accounts gpm gstreamer gtk gtk3 gtkstyle http iconv infinality introspection irc jabber jpeg kpathsea latex lcms ldap libnotify libsecret libvisual lyx mad mms mmx mmxext mng modules mono monolithic-build mp3 mp4 mpeg multilib musicbrainz nautilus ncurses network-cron networkmanager nls nptl ntfs ntp numa nvidia ogg opengl openmp optimized-qmake pam pango pch pdf png policykit ppds pulseaudio qt3support qt4 readline reiserfs scanner sdl session smp sna socialweb spell sse sse2 sse3 sse4 sse4_1 ssl ssse3 startup-notification svg systemd t1lib tcpd test theora threads tiff truetype udev udisks unicode upnp-av upower usb v4l vaapi vala vcd vdpau vorbis wifi wxwidgets x264 xattr xcb xfs xml xv xvid youtube zlib" ABI_X86="64" ALSA_CARDS="hda-intel" 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="es es_ES en_US" OFFICE_IMPLEMENTATION="libreoffice" PHP_TARGETS="php5-5" PYTHON_SINGLE_TARGET="python2_7" PYTHON_TARGETS="python2_7 python3_3" RUBY_TARGETS="ruby19 ruby20" USERLAND="GNU" VIDEO_CARDS="fbdev vesa intel i915 i965" 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, SYNC, USE_PYTHON ================================================================= Package Settings ================================================================= media-libs/libgphoto2-2.5.3.1 was built with the following: USE="exif jpeg nls -doc -examples -gd -serial -zeroconf" CAMERAS="ptp2 -adc65 -agfa_cl20 -aox -ax203 -barbie -canon -casio_qv -clicksmart310 -digigr8 -digita -dimagev -dimera3500 -directory -enigma13 -fuji -gsmart300 -hp215 -iclick -jamcam -jd11 -jl2005a -jl2005c -kodak_dc120 -kodak_dc210 -kodak_dc240 -kodak_dc3200 -kodak_ez200 -konica -konica_qm150 -largan -lg_gsm -mars -mustek -panasonic_coolshot -panasonic_dc1000 -panasonic_dc1580 -panasonic_l859 -pccam300 -pccam600 -pentax -polaroid_pdc320 -polaroid_pdc640 -polaroid_pdc700 -ricoh -ricoh_g3 -samsung -sierra -sipix_blink2 -sipix_web2 -smal -sonix -sony_dscf1 -sony_dscf55 -soundvision -spca50x -sq905 -st2205 -stv0674 -stv0680 -sx330z -topfield -toshiba_pdrm11 -tp6801"
Let me clarify this: I meant the linkage against -ldns_sd gets removed.
should be ok with 2.5.8