Hi Jay,
Thanks for your suggestion, and thank you to all for your help. With a minor modification (changing "--clean" to "--build=local", since otherwise texi2dvi does not see my other included files unless I use "-I") it does solve the problem, except for the efficiency, as Nick pointed out.
I think the only alternative would be to call a Makefile through a lisp function in this variable.
For some reason, Org export to LaTeX (and full compilation) feels a little sluggish to me; the export to LaTeX (.org => .tex) part must be quick and the rest of compilation doesn't much have to do with Org. I could probably use only one invocation of "texi2dvi --pdf --clean --verbose --batch %f" and treat the PDF as a draft and then every once in while do a full compilation.
Do you, or anyone else, have any comments or any other suggestions for speeding things up?
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Omid