* clean does not work well. Maybe have "clean" and "mrproper"? ;)

* the mail target does not work

* the "vars" target should probably be done with an extrnal script.

* support for makeindex is not good. It causes latex to always be re-run
  
  The cause for that is that the second run of latex creates a new .ind
  file.
  
  Should I skip the seperate index (and bibtex) targets?

* Add TEXMF and SYSTEXMF variables, that will be used for latex, dvips and
  xdvi
