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transcoder/basisu_astc_helpers.h has a pragma once, but it is also an implementation header (when ASTC_HELPERS_IMPLEMENTATION is defined). pragma once is not necessary here as the header has a separate ifdef guard, and it blocks attempts to compile Basis as a CMake Unity build (CMAKE_UNITY_BUILD=ON) or as a single-translation unit non-CMake build if the helpers header has been included earlier in the TU, as the second inclusion with implementation defined doesn't actually include the header.