Building R under gcc 3.4.5 on Windows will no longer be supported as from R 2.7.0. The default settings in the trunk (R-devel) are for the new version of Rtools, http://www.murdoch-sutherland.com/Rtools/Rtools27.exe in which gcc is 4.2.1. This also contains gcc-sjlj.exe, so can be used to build R 2.6.x as well. It will become the default Rtools.exe in due course. -- Brian D. Ripley, ripley at stats.ox.ac.uk Professor of Applied Statistics, http://www.stats.ox.ac.uk/~ripley/ University of Oxford, Tel: +44 1865 272861 (self) 1 South Parks Road, +44 1865 272866 (PA) Oxford OX1 3TG, UK Fax: +44 1865 272595