I'm trying to fix the appveyor setup for Boost.GIL, where I need to create a `user-config.jam` file with entries for third-party libraries libjpeg, libpng, libz, and libtiff.
While this isn't a problem with bash on travis-ci, I have a hard time doing the equivalent with appveyor, presumably because I'm unable to work out how this is spelled with cmd.exe or the PowerShell.
Here is my appveyor script:
and here is the error this results in:
I'm sure I'm not the first one to attempt to do this (i.e., create a custom user-config.jam on appveyor). Can someone see what I'm doing wrong ?
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