Can 386SX run UNIX ?

[Glenn N Woodland]

One friend of mine is planning to buy a 386SX for running a engineering
package which requires 32 bit calculation. The current version can run
on MS-DOS with DOS Extender(?), but the next release will support UNIX
only. So UNIX will be run this 386SX PC in order to run the package. 
But one person told us that 386SX cannot run UNIX, whatever which version
it is. Is this true? What's the reason behind it? Otherwise a 386 has to
purchased instead.

Please reply me by email. Thanks for your help.

-Glenn