/usr/include/dovecot/backtrace-string.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 | #ifndef BACKTRACE_STRING_H
#define BACKTRACE_STRING_H
/* Returns 0 if ok, -1 if failure. */
int backtrace_append(string_t *str);
int backtrace_get(const char **backtrace_r);
#endif
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