I'm struggling to get Boost built on a Solaris box here. Initially I was stuck on compilation errors due to v8plus issues. After some googling and trial and error I worked out what to put in user-config.jam to fix that. However, I'm now struggling with the following error: ... wrong ELF class: ELFCLASS64 I'm using gcc-3.2 and the Sun linker, trying to build a 64bit version of just the program_options and regex libraries. Here's what I've got for the user-config.jam: using gcc : : : <address-model>64 <linker-type>"sun" <compileflags>"-m64" <linkflags>"-Wl,64" <instruction-set>"v9" ; I'm basically flummoxed at this point, and my google-fu is failing to find me a solution. All the object files are 64bit so I don't know why it is complaining as it should be doing the link as 64bit. Sean. -- It's a conical sort of effort