multilib

On 64bit systems, if you want to be able to compile 32bit and 64bit binaries
Name Category Description
adobe-flash www-plugins Adobe Flash Player
apitrace dev-util A tool for tracing, analyzing, and debugging graphics APIs
atokx3 app-i18n ATOK X3 for Linux - The most famous Japanese Input Method Engine
freebsd-lib sys-freebsd FreeBSD's base system libraries
freebsd-libexec sys-freebsd FreeBSD libexec things
freebsd-ubin sys-freebsd FreeBSD's base system source for /usr/bin
gcc sys-devel The GNU Compiler Collection
glibc sys-libs GNU libc C library
glu media-libs The OpenGL Utility Library
gnat-gpl dev-lang GNAT Ada Compiler - GPL version
guacamole-server net-misc This is the proxy-daemon used by www-apps/guacamole
icc dev-lang Intel C/C++ Compiler
icedtea-bin dev-java A Gentoo-made binary build of the IcedTea JDK
idb dev-lang Intel C/C++/FORTRAN debugger
ifc dev-lang Intel FORTRAN Compiler
intel-common dev-libs Common libraries and utilities needed for Intel compilers and libraries
ipp sci-libs Intel Integrated Performance Primitives for multimedia and data processing
libaio dev-libs Asynchronous input/output library that uses the kernels native interface
libnss-cache sys-auth libnss-cache is a library that serves nss lookups
libstdc++-v3 sys-libs Compatibility package for binaries linked against a pre gcc 3.4 libstdc++

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Thank you!