app-emulation/winetricks
Easy way to install DLLs needed to work around problems in Wine
USE Flags
gui
Global: Build some GUI components (inside the guest window).
rar
Global: Enable support for non-free rar decoder
test
Global: Workaround to pull in packages needed to run with FEATURES=test. Portage-2.1.2 handles this internally, so don't set it in make.conf/package.use anymore