Linux emulation and acroread 7

[Petr Janda]

Linux emulation is installed, but I get this when I run acroread.
[elevator] ~% acroread
The OS named  DragonFly version 1.7.0-DEVELOPMENT is currently not 
installed.
Try running on an installed platform and connecting to your display.
Installed platform(s) include the following:
 Intel/Linux

What to do?