[gentoo-user] libpng flip-flops after xorg-x11 upgrade

[Hans de Hartog <dehartog@rootsr.com>]

After upgrading to xorg-x11-7.0-r1, every emerge -Du world
wants to downgrade from libpng-1.2.12 to libpng-1.2.8-r1 and
if I do that, any emerge after that wants to upgrade again to
libpng-1.2.12.
Everything seems to work fine with either version of libpng.
Here's my emerge --info:

Portage 2.1-r1 (default-linux/x86/2006.0, gcc-3.4.6, glibc-2.3.6-r4,
2.6.16.19 i686)
=================================================================
System uname: 2.6.16.19 i686 Intel(R) Celeron(R) CPU 2.66GHz
Gentoo Base System version 1.6.15
dev-lang/python:     2.4.3-r1
dev-python/pycrypto: 2.0.1-r5
dev-util/ccache:     [Not Present]
dev-util/confcache:  [Not Present]
sys-apps/sandbox:    1.2.17
sys-devel/autoconf:  2.13, 2.59-r7
sys-devel/automake:  1.4_p6, 1.5, 1.6.3, 1.7.9-r1, 1.8.5-r3, 1.9.6-r2
sys-devel/binutils:  2.16.1-r3
sys-devel/gcc-config: 1.3.13-r2
sys-devel/libtool:   1.5.22
virtual/os-headers:  2.6.11-r2
ACCEPT_KEYWORDS="x86"
AUTOCLEAN="yes"
CBUILD="i386-pc-linux-gnu"
CFLAGS="-O2 -mtune=i686 -pipe"
CHOST="i386-pc-linux-gnu"
CONFIG_PROTECT="/etc /usr/kde/3.5/env /usr/kde/3.5/share/config
/usr/kde/3.5/shutdown /usr/share/X11/xkb /usr/share/config"
CONFIG_PROTECT_MASK="/etc/env.d /etc/gconf /etc/revdep-rebuild
/etc/terminfo"
CXXFLAGS="-O2 -mtune=i686 -pipe"
DISTDIR="/usr/portage/distfiles"
FEATURES="autoconfig distlocks metadata-transfer sandbox sfperms strict"
GENTOO_MIRRORS="http://ftp.snt.utwente.nl/pub/os/linux/gentoo
ftp://ftp.snt.utwente.nl/pub/os/linux/gentoo
ftp://mirror.scarlet-internet.nl/pub/gentoo "
MAKEOPTS="-j2"
PKGDIR="/usr/portage/packages"
PORTAGE_RSYNC_OPTS="--recursive --links --safe-links --perms --times
--compress --force --whole-file --delete --delete-after --stats
--timeout=180 --exclude='/distfiles' --exclude='/local'
--exclude='/packages'"
PORTAGE_TMPDIR="/var/tmp"
PORTDIR="/usr/portage"
SYNC="rsync://rsync.europe.gentoo.org/gentoo-portage"
USE="x86 X acpi alsa apache2 apm arts avi berkdb bitmap-fonts bluetooth
bzip2 cli crypt cups dri eds emboss encode esd firefox foomaticdb
fortran gdbm gif gkrellm gpm gstreamer gtk gtk2 imlib ipv6 irda isdnlog
jpeg libg++ libwww mad madwifi mikmod motif mp3 mpeg ncurses nls nptl
nptlonly ogg opengl oss pam pcmcia pcre pdflib perl png pppd python qt
qt3 qt4 quicktime readline reflection rtc samba sdl session sox spell
spl ssl tcltk tcpd truetype truetype-fonts type1-fonts udev urandom v4l
vnc vorbis wifi xml xmms xorg xv zlib elibc_glibc input_devices_keyboard
input_devices_mouse kernel_linux userland_GNU video_cards_radeon"
Unset:  CTARGET, EMERGE_DEFAULT_OPTS, INSTALL_MASK, LANG, LC_ALL,
LDFLAGS, LINGUAS, PORTAGE_RSYNC_EXTRA_OPTS, PORTDIR_OVERLAY

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