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On a fresh MiKTeX 2.9 install, previously working piece of code


is not working anymore — -12em is being outputted in table row fields instead of being calculated. What have I missed?

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For that to work the calc package is necessary. It may have happened that a package used to load it and doesn't now in a more recent version. – egreg Feb 15 '12 at 10:27
expl3 has removed the loading of calc recently. – Ulrike Fischer Feb 15 '12 at 10:29
@Ulrike Thank you, that's it. – ipavlic Feb 15 '12 at 10:32
up vote 7 down vote accepted

You forgot


, which supports infix arithmetic in LaTeX.

Package description

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