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USE флаги

• doc - Add extra documentation (API, Javadoc, etc). It is recommended to enable per package instead of globally
• double-precision - Build libraries in double precision
• examples - Install examples, usually source code
• extras - Build the extras
• openmp - Build support for the OpenMP (support parallel computing), requires >=sys-devel/gcc-4.2 built with USE="openmp"
• tbb - Enable multithreading with the Intel Threads Building Block dev-cpp/tbb
• test - Enable dependencies and/or preparations necessary to run tests (usually controlled by FEATURES=test but can be toggled independently)
• threads - Add threads support for various packages. Usually pthreads