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 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
icedtea-bin dev-java A Gentoo-made binary build of the IcedTea JDK
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++
libtxc_dxtn media-libs Helper library for S3TC texture (de)compression
makemkv media-video Tool for ripping and streaming Blu-ray, HD-DVD and DVD discs
mkclean media-video mkclean is a command line tool to clean and optimize Matroska files
newlib sys-libs Newlib is a C library intended for use on embedded systems
novell-groupwise-client mail-client Novell Groupwise Client for Linux
nvidia-cg-toolkit media-gfx NVIDIA's C graphics compiler toolkit

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Thank you!