running commands with !

I have three different machines with a score-writing package on, and
on two of the three I can run the "compile" equivalent to create
PostScript output with
!mup -F %

On the third, I hit the following snag:

!mup {fname} reports /bin/bash: mup: command not found

>which mup reports "/usr/local/bin/mup-5.7/bin"
/usr/local/bin/mup-5.7/bin is the last entry in $PATH

Probably something pretty simple, but beyond me … hints and tips
welcome!

vim 7.2 on Ubuntu 10.04

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