It appears that the '3dnow' use flag is a default in the portage system. The similar 'sse' use flag is not a default. If 'sse' is not a default, then '3dnow' probably shouldn't be either. Also, this can cause issues for non-3dnow systems after they emerge certain packages like libvorbis. Reproducible: Always Steps to Reproduce: 1. Remove '3dnow' from the make.conf USE flags. 2. Execute "emerge -vp libvorbis" (just an example) Actual Results: Without the '3dnow' flag explicitly set, emerge still insists on building with '3dnow' support. For example: myrmidon usb # emerge -vp libvorbis These are the packages that I would merge, in order: Calculating dependencies ...done! [ebuild R ] media-libs/libvorbis-1.0-r4 -sse +3dnow Expected Results: If the '3dnow' flag is not explicitly set, I would expect it not to be in my USE flags since it is not something that is universally supported across all architectures. From 'emerge info': Portage 2.0.49-r1 (default-x86-1.4, gcc-3.2.3, glibc-2.3.2-r1, 2.4.21-pfeifer-r1_pre4) ================================================================= System uname: 2.4.21-pfeifer-r1_pre4 i686 AMD Athlon(tm) XP 1800+ ACCEPT_KEYWORDS="x86 ~x86" AUTOCLEAN="yes" CFLAGS="-march=athlon-xp -O3 -pipe -fomit-frame-pointer" CHOST="i686-pc-linux-gnu" COMPILER="gcc3" CONFIG_PROTECT="/etc /var/qmail/control /usr/kde/2/share/config /usr/kde/3/share/config /usr/X11R6/lib/X11/xkb /opt/tomcat/conf /usr/kde/3.1/share/config /usr/share/texmf/tex/generic/config/ /usr/share/texmf/tex/platex/config/ /usr/share/config" CONFIG_PROTECT_MASK="/etc/gconf /etc/env.d" CXXFLAGS="-march=athlon-xp -O3 -pipe -fomit-frame-pointer" DISTDIR="/usr/portage/distfiles" FEATURES="sandbox ccache autoaddcvs" GENTOO_MIRRORS="http://gentoo.mirrors.pair.com http://gentoo.oregonstate.edu http://www.ibiblio.org/pub/Linux/distributions/gentoo" MAKEOPTS="-j2" PKGDIR="/usr/portage/packages" PORTAGE_TMPDIR="/var/tmp" PORTDIR="/usr/portage" PORTDIR_OVERLAY="/usr/local/portage" SYNC="rsync://rsync.namerica.gentoo.org/gentoo-portage" USE="3dnow apm foomaticdb libg++ gdbm berkdb svga tcpd acpi -alsa -arts avi cdr crypt cups curl dga dvd emacs encode esd gd gif gnome gphoto2 gpm -gtk gtk2 gtkhtml imap imlib ipv6 java jpeg kde kerberos libwww mad mikmod mmx motif mozilla mpeg ncurses oggvorbis opengl oss pam -pda -pcmcia pdflib perl png python qt quicktime readline samba -nls scanner sdl slang slp socks5 spell ssl tcltk tetex tiff truetype usb wmf wxwindows X Xaw3d xml xml2 xmms xv zlib x86" From make.conf: USE="acpi -alsa -arts avi cdr crypt cups curl dga dvd emacs encode esd gd gif gnome gphoto2 gpm -gtk gtk2 gtkhtml imap imlib ipv6 java jpeg kde kerberos libwww mad mikmod mmx motif mozilla mpeg ncurses oggvorbis opengl oss pam -pda -pcmcia pdflib perl png python qt quicktime readline samba -nls scanner sdl slang slp socks5 spell ssl tcltk tetex tiff truetype usb wmf wxwindows X Xaw3d xml xml2 xmms xv zlib x86"
This is actually in make.defaults, not make.globals. I've removed it from make.defaults in default-x86-1.4.
*** Bug 27463 has been marked as a duplicate of this bug. ***
*** Bug 26826 has been marked as a duplicate of this bug. ***
