Mac OS X uses a .DS_Store file in directories to perform some sort of magic. I do not care what sort of magic as long as it does not get into my CVS repositories, Perl distributions, or anything else.
For instance, I recently downloaded a Perl distribution for CPAN Search. I just wanted to look at the distribution rather than install it. After looking at it in the Finder, I decided to install it. Since I had already looked at it in the Finder, Mac OS X silently created .DS_Store files. MakeMaker takes anything in lib and copies it into blib.
g4_brian[3136]$ perl Makefile.PL Checking if your kit is complete... Looks good Writing Makefile for Test::LongString g4_brian[3137]$ make cp lib/Test/LongString.pm blib/lib/Test/LongString.pm cp lib/Test/.DS_Store blib/lib/Test/.DS_Store cp lib/.DS_Store blib/lib/.DS_Store Manifying blib/man3/Test::LongString.3
g4_brian[3139]$ make install Installing /usr/local/lib/perl5/.DS_Store Installing /usr/local/lib/perl5/Test/.DS_Store Installing /usr/local/lib/perl5/Test/LongString.pm Installing /usr/local/man/man3/Test::LongString.3 Writing /usr/local/lib/perl5/darwin/auto/Test/LongString/.packlist Appending installation info to /usr/local/lib/perl5/darwin/perllocal.pod
find / -name .DS_Store | xargs rm -f