Fixing "Dnx Runtime package needs to be installed" error

I went to build an older project on which I hadn’t worked for a while and I found that running msbuild on the solution file like so

& "C:\Program Files (x86)\MSBuild\14.0\Bin\MSBuild.exe" .\GenFu.sln

resulted in an error which looked like

Cannot find DNX runtime dnx-clr-win-x86.1.0.0-rc1-final in the folder: C:\Users\stimms\.dnx\runtimes
C:\Program Files (x86)\MSBuild\Microsoft\VisualStudio\v14.0\DNX\Microsoft.DNX.targets(126,5): error : The Dnx Runtime package needs to be installed. See output window for more details. [C:\code\GenFu\src\GenFu\GenFu.xproj]

As it turns out the key is that this project is using dnx-clr-win-x86.1.0.0-rc1-final and my machine doesn’t have that installed. You can test out which version is installed by running dnvm list

>dnvm list

Active Version Runtime Architecture OperatingSystem Alias
------ ------- ------- ------------ --------------- -----
1.0.0-rc1-update1 clr x64 win
1.0.0-rc1-update1 clr x86 win
* 1.0.0-rc1-update1 coreclr x64 win default
1.0.0-rc1-update1 coreclr x86 win

I fixed the problem by updating the global.json to point at the newer runtime

"projects": [ "src", "test" ],
"sdk": {
"version": "1.0.0-rc1-final",
"runtime": "coreclr"

And all was good.