While using the mailto application, I noticed it complained
about an invalid mailcap entry for pdf. I checked in
/etc/mailcap and found...

application/pdf: xpdf %s

... comparing it to other similar entries it looks like it
should be...

application/pdf; xpdf %s

... and when I make that change the complaints go away.

The package mailcap-2.0.1-1 is what I'm using and the
problem falls within a number of lines denoted as having
been changed by you guys.

Semper Fi, dudes.

Bruce Tong
zztong.net