[GRASS-user] r.terraflow launch error in 6.5

[M S]

I can launch r.terraflow in GRASS 6.4, but not in 6.5.  (on kubuntu
9.10).    6.4 came from ubuntuGIS, which seems fine, however, 6.5 was
compiled from source.

Error message when launching the GUI is "Error - Couldn't execute
"r.terraflow": no such file or directory".  Then I click the OK button
in the dialog box, and get an empty dialog box with the heading
"dialog0".

Am I missing something obvious, and is there something else I can
check to determine what's wrong?

Thanks,
Mark