Hmm, so I replaced `%HOMEDRIVE%%HOMEPATH%\user-config.jam` with just `config.jam`, and got the exact same error "the system cannot find the file specified". Not very helpfull... :-(
(https://ci.appveyor.com/project/stefanseefeld/gil/ )build/1.0.110-develop/job/ i2adtwjlddoq62m0
Is it correct to think that this has nothing to do with boost and is just a Windows/appveyor issue?
If so, Stefan, can you create a script that only does the part causing the error. I like to take this to stackoverflow
-- ...ich hab' noch einen Koffer in Berlin...