/usr/include/dovecot/istream-qp.h is in dovecot-dev 1:2.2.9-1ubuntu2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 | #ifndef ISTREAM_QP_H
#define ISTREAM_QP_H
struct istream *i_stream_create_qp_decoder(struct istream *input);
#endif
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