pcsx2 (PlayStation 2 emulator) PCSX2 is a free and open-source PlayStation 2 (PS2) emulator. Its purpose is to emulate the PS2's hardware, using a combination of MIPS CPU Interpreters, Recompilers and a Virtual Machine which manages hardware states and PS2 system memory. PCSX2 requires a CPU that supports the SSE4.1 instruction set. Check your processor flags with lscpu for sse4_1. PCSX2 requires a GPU that supports OpenGL 3.3 or Vulkan 1.1. LLVM_OPT: llvm-opt is enabled by default, since upstream only supports clang. If you already installed llvm >=17 from extra or used llvm in current branch, LLVM_OPT could be disabled with LLVM_OPT=OFF.