fmt-merge-msg.hon commit doc: give some guidelines for error messages (0ae0e88)
   1#ifndef FMT_MERGE_MSG_H
   2#define FMT_MERGE_MSG_H
   3
   4extern int merge_log_config;
   5extern int fmt_merge_msg_config(const char *key, const char *value, void *cb);
   6
   7#endif /* FMT_MERGE_MSG_H */