[gentoo-user] pdftk stopped working

[Grant Edwards]

Some time in the past month or two, pdftk has completely stopped
working.  No matter what file I point it to or what commands I try, I
always get the message

  $ pdftk <whatever>
  Done.  Input errors, so no output created.

If the file doesn't actually exist, I do get the expected error:

  $ pdftk asdfasfasdf.pdf cat foo.pdf
  Error: Unable to find file.
  Error: Failed to open PDF file:
     asdfasfasdf.pdf
  Errors encountered.  No output created.
  Done.  Input errors, so no output created.

I've tried all sorts of .pdf files from various sources, and pdftk
can't seem to parse any of them.