Bugzilla Bug 127027

I was mucking around my system, seeing what twiddling USE flags would get me,
and I saw this:

# emerge -DNuvp world

These are the packages that would be merged, in order:

Calculating world dependencies... done!
[ebuild   R   ] net-misc/neon-0.25.5  USE="expat* ssl zlib" 0 kB 
[ebuild   R   ] app-text/ghostscript-esp-8.15.1  USE="X cups gtk xml* -cjk
-emacs -threads" 7,576 kB 
[ebuild   R   ] net-fs/samba-3.0.21c  USE="cups pam python readline swat xml*
-acl -async -automount -doc -examples -kerberos -ldap -ldapsam -libclamav
-mysql -oav -postgres -quotas -syslog -winbind -xml2*" 17,146 kB 
[ebuild   R   ] media-gfx/imagemagick-6.2.6.0  USE="X bzip2 jpeg lcms mpeg perl
png tiff truetype zlib -doc -fpx -graphviz -gs -jbig -minimal -nocxx -wmf
-xml2*" 5,018 kB 

According to the documentation, xml2 is deprecated, but imagemagick still uses
it to build in XML support (pulls in dev-libs/libxml2-2.4.10).  This probably
should be changed to the xml USE flag, like in the net-fs/samba/samba-3.0.21c
ebuild.

The problem is that if my USE flags are set to suggested guidelines (+xml for
xml support, -xml2 because it's deprecated), ebuilds that follow this
convention (samba) have xml support, but ebuilds that don't (imagemagick)
won't.

It also appears that previous versions of imagemagick have the same issue.

# emerge --info
Portage 2.1_pre6-r5 (default-linux/x86/2006.0, gcc-3.4.5, glibc-2.4-r1,
2.6.15-gentoo-r7 i686)
=================================================================
System uname: 2.6.15-gentoo-r7 i686 Pentium III (Coppermine)
Gentoo Base System version 1.12.0_pre16
ccache version 2.4 [disabled]
dev-lang/python:     2.4.2-r1
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-r1
sys-devel/binutils:  2.16.1-r2
sys-devel/libtool:   1.5.22
virtual/os-headers:  2.6.11-r3
ACCEPT_KEYWORDS="x86 ~x86"
AUTOCLEAN="yes"
CBUILD="i686-pc-linux-gnu"
CFLAGS="-march=pentium3 -O2 -pipe"
CHOST="i686-pc-linux-gnu"
CONFIG_PROTECT="/etc /usr/kde/2/share/config /usr/kde/3/share/config
/usr/share/X11/xkb /usr/share/config /var/qmail/control"
CONFIG_PROTECT_MASK="/etc/gconf /etc/revdep-rebuild /etc/terminfo /etc/env.d"
CXXFLAGS="-march=pentium3 -O2 -pipe"
DISTDIR="/usr/portage/distfiles"
FEATURES="autoconfig distlocks metadata-transfer sandbox sfperms strict"
GENTOO_MIRRORS="http://distfiles.gentoo.org
http://distro.ibiblio.org/pub/linux/distributions/gentoo"
PKGDIR="/usr/portage/packages"
PORTAGE_TMPDIR="/var/tmp"
PORTDIR="/usr/portage"
SYNC="rsync://rsync.us.gentoo.org/gentoo-portage"
USE="x86 X aac acpi alsa artworkextra asf avi bash-completion berkdb
bitmap-fonts bonobo bzip2 cairo cdr cli crypt ctype cups curl dba dbus dga
dlloader dri eds emboss encode expat fam fastbuild firefox flac foomaticdb
force-cgi-redirect fortran ftp gd gecko-sdk gif gimpprint gnome gpm gstreamer
gtk gtk2 gtkhtml hal imlib imlib2 ipv6 java jpeg lcms libg++ libwww mad
memlimit mikmod mmx motif mozilla mp3 mpeg mysqli nas nautilus ncurses nls nntp
nptl nptlonly nsplugin objc offensive ogg opengl pam pcre pda pdflib perl png
posix python quicktime rage128 readline real reiserfs rtc samba sdl session
simplexml soap sockets spell spl sse ssl svg swat symlink tcpd tiff tokenizer
truetype truetype-fonts type1-fonts udev unicode usb vorbis win32codecs xine
xml xmms xsl xv zlib elibc_glibc input_devices_keyboard input_devices_mouse
kernel_linux userland_GNU video_cards_nv video_cards_vga video_cards_vesa"
Unset:  ASFLAGS, CTARGET, EMERGE_DEFAULT_OPTS, LANG, LC_ALL, LDFLAGS, LINGUAS,
MAKEOPTS, PORTDIR_OVERLAY

*** This bug has been marked as a duplicate of 116346 ***