I just ran a: git clone --recursive https://github.com/boostorg/boost boost_root and I got some warnings in lexical_cast: Cloning into 'D:/teeks99-09/boost_root/libs/lambda'... Cloning into 'D:/teeks99-09/boost_root/libs/lexical_cast'... warning: unable to unlink 'D:/teeks99-09/boost_root/.git/modules/lexical_cast/objects/b1/102161720ea50668a5756828409400a4314744.temp': Invalid argument warning: unable to unlink 'D:/teeks99-09/boost_root/.git/modules/lexical_cast/objects/8a/0a6c194259a9a3fa24ea3fb815899bfcbfed64.temp': Invalid argument warning: unable to unlink 'D:/teeks99-09/boost_root/.git/modules/lexical_cast/objects/47/dd68ef6ee5c02257a57d03ac9e611a68893d0d.temp': Invalid argument warning: unable to unlink 'D:/teeks99-09/boost_root/.git/modules/lexical_cast/objects/02/b86ef5bcc4574e5c03b75ed463dbb5ada446c9.temp': Invalid argument warning: unable to unlink 'D:/teeks99-09/boost_root/.git/modules/lexical_cast/objects/c2/b4875ef060ea7de75feceb1f20284766128325.temp': Invalid argument Cloning into 'D:/teeks99-09/boost_root/libs/local_function'... I don't think these are an issue necessarily but it might be something that can be cleaned up. Tom