Hi John, something seems to be going wrong. After the removal, I get /home/hunold/src/devel/boost/boost/type_traits/common_type.hpp:70:22: warning: variadic templates only available with -std=c++0x or -std=gnu++0x /home/hunold/src/devel/boost/boost/type_traits/common_type.hpp:150:46: warning: variadic templates only available with -std=c++0x or -std=gnu++0x as soon as TypeTraits are used. This ist gcc-4.5, gcc-4.4 and gcc-4.6 (Mingw) Yours, Jürgen -- * Dipl.-Math. Jürgen Hunold ! Ingenieurgesellschaft für * voice: ++49 511 262926 57 ! Verkehrs- und Eisenbahnwesen mbH * fax : ++49 511 262926 99 ! Lister Straße 15 * juergen.hunold@ivembh.de ! www.ivembh.de * * Geschäftsführer: ! Sitz des Unternehmens: Hannover * Prof. Dr.-Ing. Thomas Siefer ! Amtsgericht Hannover, HRB 56965 * PD Dr.-Ing. Alfons Radtke !