@item
@code{flock} locks replaced with POSIX @code{fcntl} ones.
They could be more portable.
+@item
+ @command{redo-depfix} command appeared, that traverses through all
+ @file{.redo} directories and their dependency files, checks if
+ corresponding targets has the same content but different
+ @code{ctime}/@code{mtime} values and rewrites dependencies with that
+ updated inode information.
+@item
+ With @env{$REDO_STOP_IF_MODIFIED=1} environment variable redo will
+ stop and fail if it meet externally modified file. By default user
+ is only warned about it, but building continues for convenience.
@end itemize
@anchor{Release 1_21_0}