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WiX v4 Random Fact No. 3

WiX Toolset v4-preview.0 is available. For more information, see Rob’s blog post on the matter.

Building WiX v4 is quite a bit easier than it was building WiX v3. That said, there are still some steps you need to take that prevent it from being a purely out-of-the-box experience.

One problem you might run into – I know, because I did – is that if you have an alias or the MSBuild autoresponse file MSBuild.rsp configured, you might run into problems building WiX v4. Specifically, in my case, I had an alias that automatically enabled multiproc builds using the /maxcpucount switch. Though we intend to make the build more multiproc-friendly, today it’s driven by batch files at each top-level directory and objects to building with the /m switch. I fixed my alias and all is well.