The following forum message was posted by piotr_dobrogost at http://sourceforge.net/projects/pydev/forums/forum/293649/topic/2301029:
Well it has been 3 years since you asked but better later than never :) There
is [i]Environment[/i] tab which allows to set environment variables specific
to Python interpreter ([i]Window|Preferences|PyDev|Interpeter - ...[/i]). I
guess that's what you wanted.