multilib

On 64bit systems, if you want to be able to compile 32bit and 64bit binaries
Name Category Description
apitrace dev-util Tool for tracing, analyzing, and debugging graphics APIs
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++
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
nvidia-drivers x11-drivers NVIDIA Accelerated Graphics Driver
opera www-client A fast and secure web browser
oracle-instantclient-basic dev-db Transition package moving to single dev-db/oracle-instantclient package
oracle-instantclient-jdbc dev-db Transition package moving to single dev-db/oracle-instantclient package
oracle-instantclient-odbc dev-db Transition package moving to single dev-db/oracle-instantclient package
rr dev-util Record and Replay Framework

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Thank you!