On Wed, 17 May 2006, Heiko Oberdiek submitted an update to the pdftex.def file.
Location on CTAN: graphics/pdftex/pdftex.def
Latest changes:
% 2006/05/17 v0.03q % * Error message if ConTeXt's supp-pdf.tex is missing and % support of MPS files is not available (Markus Kohm, HO).
Thanks for the update.
For the CTAN Team Rainer Schöpf