I'm still playing about, trying to get boost to compile on my Solaris 9 box with the 5.5 SUN compiler. As there is no compiler configuration yet for the 5.5 compiler I tried to run 'configure' in libs/config/tools to generate a user.hpp file. Unfortunately the installed configure assumes that 'tr' knows how to handle character classes. The one on the Solaris 9 box I've got at work doesn't, so trying to use configure to create a user/compiler specific configuration does produce no meaningful output as all the tests fail. The attached patch to boost_1_32_0/libs/config/tools/configure.in fixes that problem for the price of dumbing down the tr invocation. A 'configure' patched along the same lines (the box doesn't have autoconf installed) produced the desired output which will hopefully allow me to get a bit further building boost on the 5.5 compiler. Regards, Timo