Junio C Hamano wrote:

> I amended the log message like so:
> commit bd9df384b16077337fffe9836c9255976b0e7b91
> Author: Matt Kraai <matt.kr...@amo.abbott.com>
> Date:   Wed Feb 13 07:57:48 2013 -0800
>     Makefile: don't run rm without any files
>     When COMPUTE_HEADER_DEPENDENCIES is set to "auto" and the compiler
>     does not support it, $(dep_dirs) becomes empty.  "make clean" runs
>     "rm -rf $(dep_dirs)", which fails in such a case.

To pedantic, that only fails on some platforms.  The autoconf manual

        It is not portable to invoke rm without options or operands. On the
        other hand, Posix now requires rm -f to silently succeed when there are
        no operands (useful for constructs like rm -rf $filelist without first
        checking if ‘$filelist’ was empty). But this was not always portable; at
        least NetBSD rm built before 2008 would fail with a diagnostic.

Anyway, looks like a good fix.  Thanks.
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