A word from the field, and sorry it took me awhile to track down my notes:
I have a script that worked fine for months, doing something like my @pdfs = glob("$path/*.pdf");. One day the script failed, and with use diagnostics; I got this:
internal error: glob failed at ...
(P) Something went wrong with the external program(s) used for glob and <*.c>. This may mean that your csh (C shell) is broken. If so, you should change all of the csh-related variables in config.sh: If you have tcsh, make the variables refer to it as if it were csh (e.g. full_csh='/usr/bin/tcsh'); otherwise, make them all empty (except that d_csh should be 'undef') so that Perl will think csh is missing. In either case, after editing config.sh, run ./Configure -S and rebuild Perl.
There were not "too many files", which I had seen before with glob. This was new... The environment is out of my hands, so I simply gave up with glob and used File::Find.
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