Code change:
(fetchNuGet { pname = "Microsoft.Net.Compilers.Toolset"; version = "4.2.0-1.final"; sha256 = "02zas22hj29gv2w7h74q786i0cvxffgwqai21ri0zj41nb2hwhyq"; url = "https://pkgs.dev.azure.com/dnceng/9ee6d478-d288-47f7-aacc-f6e6d082ae6d/_packaging/45bacae2-5efb-47c8-91e5-8ec20c22b4f8/nuget/v3/flat2/microsoft.net.compilers.toolset/4.2.0-1.final/microsoft.net.compilers.toolset.4.2.0-1.final.nupkg"; }) (fetchNuGet { pname = "Microsoft.NETCore.App.Host.linux-arm64"; version = "3.1.32"; sha256 = "1zygp70xrk5zggs3q4a6yc6jfdwzcsjjsapqpwn6qyx35m69b72p"; url = "https://pkgs.dev.azure.com/dnceng/9ee6d478-d288-47f7-aacc-f6e6d082ae6d/_packaging/45bacae2-5efb-47c8-91e5-8ec20c22b4f8/nuget/v3/flat2/microsoft.netcore.app.host.linux-arm64/3.1.32/microsoft.netcore.app.host.linux-arm64.3.1.32.nupkg"; }) (fetchNuGet { pname = "Microsoft.NETCore.App.Host.linux-x64"; version = "3.1.32"; sha256 = "08sar3s7j6z1q5prjmz2jrbsq5ms81mrsi1c1zbfrkplkfjpld3a"; url = "https://pkgs.dev.azure.com/dnceng/9ee6d478-d288-47f7-aacc-f6e6d082ae6d/_packaging/45bacae2-5efb-47c8-91e5-8ec20c22b4f8/nuget/v3/flat2/microsoft.netcore.app.host.linux-x64/3.1.32/microsoft.netcore.app.host.linux-x64.3.1.32.nupkg"; }) <ins> (fetchNuGet { pname = "Microsoft.NETCore.App.Host.osx-x64"; version = "3.1.32"; sha256 = "186gjn8sbhp4z6pq8fw4g8nqk9dwyaplwvdz2y3fbbvg36lggsh0"; url = "https://pkgs.dev.azure.com/dnceng/9ee6d478-d288-47f7-aacc-f6e6d082ae6d/_packaging/45bacae2-5efb-47c8-91e5-8ec20c22b4f8/nuget/v3/flat2/microsoft.netcore.app.host.osx-x64/3.1.32/microsoft.netcore.app.host.osx-x64.3.1.32.nupkg"; }) </ins> (fetchNuGet { pname = "Microsoft.NETCore.App.Ref"; version = "3.1.0"; sha256 = "08svsiilx9spvjamcnjswv0dlpdrgryhr3asdz7cvnl914gjzq4y"; url = "https://pkgs.dev.azure.com/dnceng/9ee6d478-d288-47f7-aacc-f6e6d082ae6d/_packaging/45bacae2-5efb-47c8-91e5-8ec20c22b4f8/nuget/v3/flat2/microsoft.netcore.app.ref/3.1.0/microsoft.netcore.app.ref.3.1.0.nupkg"; }) (fetchNuGet { pname = "Microsoft.NETCore.App.Runtime.linux-arm64"; version = "3.1.32"; sha256 = "13pcn74z1swz73s72zjl07f118j35wacnzgk7kbjqn83nwgqdgvq"; url = "https://pkgs.dev.azure.com/dnceng/9ee6d478-d288-47f7-aacc-f6e6d082ae6d/_packaging/45bacae2-5efb-47c8-91e5-8ec20c22b4f8/nuget/v3/flat2/microsoft.netcore.app.runtime.linux-arm64/3.1.32/microsoft.netcore.app.runtime.linux-arm64.3.1.32.nupkg"; }) (fetchNuGet { pname = "Microsoft.NETCore.App.Runtime.linux-x64"; version = "3.1.32"; sha256 = "0mmc57dl8plrspdxwb7209wz29vhiwqds4nfbdfws7zg35yy70c7"; url = "https://pkgs.dev.azure.com/dnceng/9ee6d478-d288-47f7-aacc-f6e6d082ae6d/_packaging/45bacae2-5efb-47c8-91e5-8ec20c22b4f8/nuget/v3/flat2/microsoft.netcore.app.runtime.linux-x64/3.1.32/microsoft.netcore.app.runtime.linux-x64.3.1.32.nupkg"; }) <ins> (fetchNuGet { pname = "Microsoft.NETCore.App.Runtime.osx-x64"; version = "3.1.32"; sha256 = "06bk39zcv27cwshjsxfg5d6wzkkzdhfk08sipdc7mr1s8pk7ihi1"; url = "https://pkgs.dev.azure.com/dnceng/9ee6d478-d288-47f7-aacc-f6e6d082ae6d/_packaging/45bacae2-5efb-47c8-91e5-8ec20c22b4f8/nuget/v3/flat2/microsoft.netcore.app.runtime.osx-x64/3.1.32/microsoft.netcore.app.runtime.osx-x64.3.1.32.nupkg"; }) </ins> (fetchNuGet { pname = "Microsoft.NETCore.Platforms"; version = "1.0.1"; sha256 = "01al6cfxp68dscl15z7rxfw9zvhm64dncsw09a1vmdkacsa2v6lr"; url = "https://pkgs.dev.azure.com/dnceng/9ee6d478-d288-47f7-aacc-f6e6d082ae6d/_packaging/45bacae2-5efb-47c8-91e5-8ec20c22b4f8/nuget/v3/flat2/microsoft.netcore.platforms/1.0.1/microsoft.netcore.platforms.1.0.1.nupkg"; }) (fetchNuGet { pname = "Microsoft.NETCore.Platforms"; version = "1.1.0"; sha256 = "08vh1r12g6ykjygq5d3vq09zylgb84l63k49jc4v8faw9g93iqqm"; url = "https://pkgs.dev.azure.com/dnceng/9ee6d478-d288-47f7-aacc-f6e6d082ae6d/_packaging/45bacae2-5efb-47c8-91e5-8ec20c22b4f8/nuget/v3/flat2/microsoft.netcore.platforms/1.1.0/microsoft.netcore.platforms.1.1.0.nupkg"; }) (fetchNuGet { pname = "Microsoft.NETCore.Platforms"; version = "1.1.1"; sha256 = "164wycgng4mi9zqi2pnsf1pq6gccbqvw6ib916mqizgjmd8f44pj"; url = "https://pkgs.dev.azure.com/dnceng/9ee6d478-d288-47f7-aacc-f6e6d082ae6d/_packaging/45bacae2-5efb-47c8-91e5-8ec20c22b4f8/nuget/v3/flat2/microsoft.netcore.platforms/1.1.1/microsoft.netcore.platforms.1.1.1.nupkg"; })

Related discussion:
text: Steps to reproduce the behavior: msbuild Trying to build msbuild on a mac fails. <!-- Please @ people who are in the list of the offending package or module. If in doubt, check for whoever last touched something. --Please run and paste the result.