[racket] compiling racket under low resource systems?

I'm trying to update to Racket 5.3 under one of my shared servers, and
unfortunately I'm running into resource issues: I'm only allowed a
maximum of 256MB ram, and the build, using default settings, takes
significantly more than this.  I suspect one source of issues is the
parallel build during the bytecode compilation of the collections.

What options can I use with ./configure to force it to use minimal
resources?  Thanks!