/usr/include/dovecot/utc-offset.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 7 8 9 | #ifndef UTC_OFFSET_H
#define UTC_OFFSET_H
#include <time.h>
/* Returns given time's offset to UTC in minutes. */
int utc_offset(struct tm *tm, time_t t);
#endif
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