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USE flags

• 10bit - Add support for producing 10bits HEVC.
• 12bit - Add support for producing 12bits HEVC.
• abi_mips_n32 - 64-bit (32-bit pointer) libraries
• abi_mips_n64 - 64-bit libraries
• abi_mips_o32 - 32-bit libraries
• abi_s390_32 - 32-bit (s390) libraries
• abi_s390_64 - 64-bit (s390x) libraries
• abi_x86_32 - 32-bit (x86) libraries
• abi_x86_64 - 64-bit (amd64) libraries
• abi_x86_x32 - x32 ABI libraries
• cpu_flags_arm_neon - Use the NEON (ASIMD) instruction set
• cpu_flags_ppc_vsx2 - Use the Vector Scalar Extension v.2 instruction set (POWER8 and later)
• numa - Build with support for NUMA nodes.
• pic - Disable optimized assembly code that is not PIC friendly
• test - Enable dependencies and/or preparations necessary to run tests (usually controlled by FEATURES=test but can be toggled independently)