Bugzilla Bug 125882

checking for libebml version >= 0.7.5... no
*** Your Ebml version is too old. Upgrade to at least version
*** 0.7.5 and re-run configure.

Ther proper version should be required in the ebuild.

agreed, same here

Portage 2.0.54 (default-linux/x86/2005.1, gcc-3.3.6, glibc-2.3.5-r2,
2.6.15-gentoo-r1 i686)
=================================================================
System uname: 2.6.15-gentoo-r1 i686 Intel(R) Pentium(R) 4 CPU 3.40GHz
Gentoo Base System version 1.6.14
distcc 2.18.3 i686-pc-linux-gnu (protocols 1 and 2) (default port 3632)
[disabled]
ccache version 2.3 [enabled]
dev-lang/python:     2.3.5-r2, 2.4.2-r1
sys-apps/sandbox:    1.2.12
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-r1
sys-devel/binutils:  2.16.1
sys-devel/libtool:   1.5.22
virtual/os-headers:  2.6.11-r2
ACCEPT_KEYWORDS="x86"
AUTOCLEAN="yes"
CBUILD="i686-pc-linux-gnu"
CFLAGS="-Os -march=pentium4 -pipe"
CHOST="i686-pc-linux-gnu"
CONFIG_PROTECT="/etc /usr/kde/2/share/config /usr/kde/3.4/env
/usr/kde/3.4/share/config /usr/kde/3.4/shutdown /usr/kde/3/share/config
/usr/lib/X11/xkb /usr/lib/mozilla/defaults/pref /usr/share/config
/usr/share/texmf/dvipdfm/config/ /usr/share/texmf/dvips/config/
/usr/share/texmf/tex/generic/config/ /usr/share/texmf/tex/platex/config/
/usr/share/texmf/xdvi/ /var/qmail/control"
CONFIG_PROTECT_MASK="/etc/gconf /etc/terminfo /etc/env.d"
CXXFLAGS="-Os -march=pentium4 -pipe"
DISTDIR="/usr/portage/distfiles"
FEATURES="autoconfig candy ccache distlocks sandbox sfperms strict"
GENTOO_MIRRORS="http://distfiles.gentoo.org
http://distro.ibiblio.org/pub/linux/distributions/gentoo"
LANG="pl_PL"
LC_ALL="pl_PL"
LINGUAS="pl"
MAKEOPTS="-j3"
PKGDIR="/usr/portage/packages"
PORTAGE_TMPDIR="/var/tmp"
PORTDIR="/usr/portage"
SYNC="rsync://rsync.gentoo.org/gentoo-portage"
USE="x86 X aac aalib accessibility acpi alsa apache2 arts asf audiofile avi
bash-completion berkdb bidi bitmap-fonts bzip2 cdinstall cdparanoia cdr crypt
css cups curl dga doc dri dvd dvdr dvdread eds emboss encode escreen esd exif
expat fam fbcon ffmpeg firefox flac foomaticdb fortran ftp gcj gd gdbm gif
gimpprint glut gmp gphoto2 gpm gstreamer gtk gtk2 gtkhtml hal iconv idn
ieee1394 imagemagick imlib ipv6 jack java javascript jpeg jpeg2k junit
kadu-modules kadu-voice kde lcms libg++ libwww lirc mad matroska md5sum mhash
mikmod mime ming mjpeg mmx mng mono motif mozilla mp3 mpeg ncurses nls nsplugin
nvidia objc odbc offensive ogg oggvorbis openal opengl oss pam pcre pda pdf
pdflib perl png ppds python qt quicktime readline real recode ruby samba
scanner sdl slang snmp sox spell sse sse2 ssl svg svga tcltk tcpd tetex thread
tidy tiff timidity truetype truetype-fonts type1 type1-fonts udev usb v4l
videos vim-with-x vorbis win32codecs wxwindows xine xml xml2 xmms xpm xv xvid
zlib linguas_pl userland_GNU kernel_linux elibc_glibc"
Unset:  ASFLAGS, CTARGET, LDFLAGS, PORTDIR_OVERLAY

Thanks for reporting, fixed in portage.