When you build xz on Windows, the library is called liblzma.lib, but we see in : `cmake-3.9\Modules\FindLibLZMA.cmake` ``` find_library(LIBLZMA_LIBRARY lzma) ``` .. this does not work on Windows. I am working around this by adding: `-DCMAKE_FIND_LIBRARY_PREFIXES=";lib"` to my commandline.