Hi, I'm testing newer versions of boost than 1.70 currently distributed with CCTBX. I can't remember if I have to do something special other than unpacking the zip file, say boost_1_74_0.zip, that I download from boost.org and put it into the modules directory for my cctbx build. But I get several errors during build like: C:\Users\Oeffner\OeffnerStuff\Work\PhenixVoyager\modules\boost\libs\filesystem\src\codecvt_error_category.cpp(71): error C2491: 'boost::filesystem::codecvt_error_category': definition of dllimport function not allowed I'm have tried with the VS2015, VS2017 and the VS2019 compiler and they all complain. So I'm wondering if there are some other magic invocations that have to be done before building with a new version of boost. Thanks in advance for any suggestions, Rob -- Robert Oeffner, Ph.D. Research Associate, The Read Group Department of Haematology, Cambridge Institute for Medical Research University of Cambridge Cambridge Biomedical Campus The Keith Peters Building Hills Road Cambridge CB2 0XY www.cimr.cam.ac.uk/investigators/read/index.html tel: +44(0)1223 763234 -- This email has been checked for viruses by AVG. https://www.avg.com