Is it possible to select the PDF version that is produced by running "context file.tex"?

For example, running "context file.tex" produced "file.pdf" of PDF version _1.5_ on Ubuntu with ConTeXt  ver: 2009.11.26 16:28 MKIV and of PDF version _1.6_ on Mac OS X with ConTeXt  ver: 2010.05.24 13:05 MKIV.

I would like to produce PDF version _1.5_ on Mac OS X with ConTeXt  ver: 2010.05.24 13:05 MKIV.