It seems logical to add a --reflink option to the install(1) utility since it, like cp, also copies files. Enabling such an option would theoretically speed up `make install` in quite some cases.
A related problem is whether reflink=auto should be default for `install`, since `install` does not tend to have new flags added and Makefile writers don't usually add a INSTALLFLAGS variable to handle them. To truly take advantage of such a change making it default may be necessary. Personally I believe that the argument against using reflink by default in cp does not apply to this case[1], as nobody uses `install` to backup files. [1]: https://unix.stackexchange.com/a/152639/73443
