maildir2mbox doesn't work

[Howard Miller]

When running maildir2mbox it complains the MAILTMP is not set. It 
is!  Seems like a bug.

e.g.

 >MAILDIR=$HOME/Maildir/
 >MAIL=$HOME/mbox
 >MAILTMP=$HOME/.mailtemp
 >maildir2mbox
Error. MAILTMP not set   (or something like that)


HM