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/usr/include/apt-pkg/sha256.h is in libapt-pkg-dev 1.0.1ubuntu2.19.

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The actual contents of the file can be viewed below.

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#ifndef APTPKG_SHA256_H
#define APTPKG_SHA256_H

#include "sha2.h"

#warning "This header is deprecated, please include sha2.h instead"

#endif