diff --git a/FSharpBuild.Directory.Build.targets b/FSharpBuild.Directory.Build.targets
index ef7f82861c5..fa39d7498fd 100644
--- a/FSharpBuild.Directory.Build.targets
+++ b/FSharpBuild.Directory.Build.targets
@@ -34,6 +34,7 @@
     </CreateItem>
   </Target>
 
+  <Import Project="build\targets\NGenOrCrossGen.targets" />
   <Import Project="build\targets\ConvertPortablePdbs.targets" />
   <Import Project="build\targets\GenerateAssemblyAttributes.targets" />
   <Import Project="build\targets\GenerateInternalsVisibleTo.targets" />
diff --git a/FSharpTests.Directory.Build.props b/FSharpTests.Directory.Build.props
index d9fc35fc05d..46e9b6fb369 100644
--- a/FSharpTests.Directory.Build.props
+++ b/FSharpTests.Directory.Build.props
@@ -23,7 +23,7 @@
     <FsiToolPath>$(MSBuildThisFileDirectory)artifacts\toolset\dotnet</FsiToolPath>
     <FsiToolExe Condition="'$(OS)' != 'Unix'">dotnet.exe</FsiToolExe>
     <FsiToolExe Condition="'$(OS)' == 'Unix'">dotnet</FsiToolExe>
-    <DotnetFsiCompilerPath>$(MSBuildThisFileDirectory)artifacts\bin\fsi\$(Configuration)\netcoreapp2.0\fsi.exe</DotnetFsiCompilerPath>
+    <DotnetFsiCompilerPath>$(MSBuildThisFileDirectory)artifacts\bin\fsi\$(Configuration)\netcoreapp2.1\fsi.exe</DotnetFsiCompilerPath>
   </PropertyGroup>
 
   <!-- SDK targets override -->
diff --git a/Makefile b/Makefile
index e402025e0ef..14a5b0a8c07 100644
--- a/Makefile
+++ b/Makefile
@@ -37,13 +37,13 @@ build: proto restore
 	$(DotNetExe) build -c $(Configuration) -f netstandard1.6 src/fsharp/FSharp.Compiler.Private/FSharp.Compiler.Private.fsproj
 	$(DotNetExe) build -c $(Configuration) -f netcoreapp2.1 src/fsharp/fsc/fsc.fsproj
 	$(DotNetExe) build -c $(Configuration) -f netstandard1.6 src/fsharp/FSharp.Compiler.Interactive.Settings/FSharp.Compiler.Interactive.Settings.fsproj
-	$(DotNetExe) build -c $(Configuration) -f netcoreapp2.0 src/fsharp/fsi/fsi.fsproj
+	$(DotNetExe) build -c $(Configuration) -f netcoreapp2.1 src/fsharp/fsi/fsi.fsproj
 	$(DotNetExe) build -c $(Configuration) -f netcoreapp2.0 tests/FSharp.Core.UnitTests/FSharp.Core.UnitTests.fsproj
 	$(DotNetExe) build -c $(Configuration) -f netcoreapp2.0 tests/FSharp.Build.UnitTests/FSharp.Build.UnitTests.fsproj
 
 test: build
-	$(DotNetExe) test -f netcoreapp2.0 -c $(Configuration) --no-restore --no-build tests/FSharp.Core.UnitTests/FSharp.Core.UnitTests.fsproj -l "trx;LogFileName=$(CURDIR)/tests/TestResults/FSharp.Core.UnitTests.coreclr.trx"
-	$(DotNetExe) test -f netcoreapp2.0 -c $(Configuration) --no-restore --no-build tests/FSharp.Build.UnitTests/FSharp.Build.UnitTests.fsproj -l "trx;LogFileName=$(CURDIR)/tests/TestResults/FSharp.Build.UnitTests.coreclr.trx"
+	$(DotNetExe) test -f netcoreapp2.1 -c $(Configuration) --no-restore --no-build tests/FSharp.Core.UnitTests/FSharp.Core.UnitTests.fsproj -l "trx;LogFileName=$(CURDIR)/tests/TestResults/FSharp.Core.UnitTests.coreclr.trx"
+	$(DotNetExe) test -f netcoreapp2.1 -c $(Configuration) --no-restore --no-build tests/FSharp.Build.UnitTests/FSharp.Build.UnitTests.fsproj -l "trx;LogFileName=$(CURDIR)/tests/TestResults/FSharp.Build.UnitTests.coreclr.trx"
 
 clean:
 	rm -rf $(CURDIR)/artifacts
diff --git a/build.cmd b/build.cmd
index 389679d5ba4..2556b718f15 100644
--- a/build.cmd
+++ b/build.cmd
@@ -1,6 +1,5 @@
 rem Copyright (c) Microsoft Corporation.  All Rights Reserved.  See License.txt in the project root for license information.
 @if "%_echo%"=="" echo off
-
 setlocal enableDelayedExpansion
 
 :ARGUMENTS_VALIDATION
@@ -66,6 +65,7 @@ set BUILD_FCS=0
 set BUILD_CONFIG=Release
 set BUILD_DIAG=
 set BUILD_PUBLICSIGN=0
+set BUILD_FSHARP_PROJ=1
 
 set TEST_NET40_COMPILERUNIT_SUITE=0
 set TEST_NET40_COREUNIT_SUITE=0
@@ -464,10 +464,15 @@ if /i "%TEST_NET40_FSHARP_SUITE" == "1" (
 )
 
 rem Decide if Proto need building
-if NOT EXIST Proto\net40\bin\fsc.exe (
+if NOT EXIST "%~dp0artifacts\bin\fsc\Proto\net46\fsc.exe" (
   set BUILD_PROTO=1
 )
 
+rem decide if FSharp.Proj needs building
+if "%BUILD_NET40%"=="0" if "%BUILD_NET40_FSHARP_CORE%"=="0" if "%BUILD_CORECLR%"=="0" if "%BUILD_VS%"=="0" if "%BUILD_FCS%"=="0" if "%TEST_NET40_COMPILERUNIT_SUITE%"=="0" if "%TEST_NET40_COREUNIT_SUITE%"=="0" if "%TEST_NET40_FSHARP_SUITE%"=="0" if "%TEST_NET40_FSHARPQA_SUITE%"=="0" if "%TEST_CORECLR_COREUNIT_SUITE%"=="0" if "%TEST_CORECLR_FSHARP_SUITE%"=="0" if "%TEST_VS_IDEUNIT_SUITE%"=="0" if "%TEST_FCS%"=="0" if "%TEST_END_2_END%"=="0" if "%COPY_FSCOMP_RESOURCE_FOR_BUILD_FROM_SOURCES%"=="0" (
+   set BUILD_FSHARP_PROJ=0
+)
+
 rem
 rem This stops the dotnet cli from hunting around and 
 rem finding the highest possible dotnet sdk version to use.
@@ -483,7 +488,6 @@ echo BUILD_PROTO_WITH_CORECLR_LKG=%BUILD_PROTO_WITH_CORECLR_LKG%
 echo BUILD_NET40=%BUILD_NET40%
 echo BUILD_NET40_FSHARP_CORE=%BUILD_NET40_FSHARP_CORE%
 echo BUILD_CORECLR=%BUILD_CORECLR%
-echo BUILD_FROMSOURCE=%BUILD_FROMSOURCE%
 echo BUILD_VS=%BUILD_VS%
 echo BUILD_FCS=%BUILD_FCS%
 echo BUILD_SETUP=%BUILD_SETUP%
@@ -491,6 +495,8 @@ echo BUILD_NUGET=%BUILD_NUGET%
 echo BUILD_CONFIG=%BUILD_CONFIG%
 echo BUILD_PUBLICSIGN=%BUILD_PUBLICSIGN%
 echo BUILD_MICROBUILD=%BUILD_MICROBUILD%
+echo BUILD_FROMSOURCE=%BUILD_FROMSOURCE%
+echo BUILD_FSHARP_PROJ=%BUILD_FSHARP_PROJ%
 echo.
 echo PB_SKIPTESTS=%PB_SKIPTESTS%
 echo PB_RESTORESOURCE=%PB_RESTORESOURCE%
@@ -665,7 +671,7 @@ if "%BUILD_PROTO%" == "1" (
 
 echo ---------------- Done with SDK restore, starting build ------------------------
 
-if "%BUILD_PHASE%" == "1" (
+if "%BUILD_PHASE%" == "1" if "%BUILD_FSHARP_PROJ%" == "1" (
 
     echo %_dotnetexe% restore fsharp.proj /p:Configuration=%BUILD_CONFIG% /bl:!logdir!\fsharp.proj.restore.binlog
          %_dotnetexe% restore fsharp.proj /p:Configuration=%BUILD_CONFIG% /bl:!logdir!\fsharp.proj.restore.binlog
@@ -1072,6 +1078,7 @@ goto :success
 REM ------ exit -------------------------------------
 :failure
 endlocal
+@echo
 exit /b 1
 
 :success
diff --git a/build/targets/NGenOrCrossGen.targets b/build/targets/NGenOrCrossGen.targets
new file mode 100644
index 00000000000..33dcaa3a63a
--- /dev/null
+++ b/build/targets/NGenOrCrossGen.targets
@@ -0,0 +1,36 @@
+<Project>
+
+  <Target Name="NGenWindowsBinaries"
+          AfterTargets="AfterBuild"
+          DependsOnTargets="CheckAdministratorPrivilege"
+          Condition="'$(OS)' != 'Unix' AND
+                     $(TargetFramework.StartsWith('net4')) AND 
+                     '$(NGenBinary)' == 'true' AND
+                     Exists('$(TargetPath)') ">
+    <PropertyGroup>
+      <PathToNGen64>$(windir)\Microsoft.NET\Framework64\v4.0.30319\ngen.exe</PathToNGen64>
+      <PathToNGen32>$(windir)\Microsoft.NET\Framework\v4.0.30319\ngen.exe</PathToNGen32>
+    </PropertyGroup>
+
+    <!-- 
+        NGen for both 32 and 64 bit product.
+        If compiling use the app config file, if present.
+    -->
+    <Exec Command='"$(PathToNGen64)" install "$(TargetPath)" /ExeConfig:$(TargetPath)' Condition = "Exists('$(PathToNGen64)') AND Exists('$(TargetPath).config') AND '$(IsAdministrator)' == 'true'"/>
+    <Exec Command='"$(PathToNGen32)" install "$(TargetPath)" /ExeConfig:$(TargetPath)' Condition = "Exists('$(PathToNGen32)') AND Exists('$(TargetPath).config') AND '$(IsAdministrator)' == 'true'"/>
+    <Exec Command='"$(PathToNGen64)" install "$(TargetPath)"' Condition = " Exists('$(PathToNGen64)') AND (!Exists('$(TargetPath).config')) AND '$(IsAdministrator)' == 'true' "/>
+    <Exec Command='"$(PathToNGen32)" install "$(TargetPath)"' Condition = " Exists('$(PathToNGen32)') AND (!Exists('$(TargetPath).config')) AND '$(IsAdministrator)' == 'true' "/>
+  </Target>
+
+  <!-- Amazingly the net session command returns 0 if in an administrator session and > 0 if not --> 
+  <Target Name="CheckAdministratorPrivilege" Condition="'$(OS)' != 'Unix'">
+    <Exec Command="NET SESSION" ConsoleToMSBuild="false" ContinueOnError="true">
+      <Output TaskParameter="ExitCode" PropertyName="ErrorCode"/>
+    </Exec>
+    <PropertyGroup>
+      <IsAdministrator Condition = " '$(ErrorCode)' == '0' ">true</IsAdministrator>
+      <IsAdministrator Condition = " '$(ErrorCode)' != '0' ">false</IsAdministrator>
+    </PropertyGroup>
+  </Target>
+
+</Project>
diff --git a/fsharp.proj b/fsharp.proj
index e695da391c9..59436e5a2e7 100644
--- a/fsharp.proj
+++ b/fsharp.proj
@@ -36,21 +36,50 @@
     <TestIDE Condition="'$(TEST_VS_IDEUNIT_SUITE)' == '1'">true</TestIDE>
   </PropertyGroup>
 
+  <!--
+    If NET40 was specified then build desktop only
+    if NETCORE was specified then build the coreclr only
+    otherwise build it all
+  -->
+  <PropertyGroup>
+    <BuildNetcore Condition="'$(BUILD_NET40)' != '1'and '$(BUILD_CORECLR)' == '1'">true</BuildNetcore>
+    <BuildDesktop Condition="'$(BUILD_NET40)' == '1' and '$(BUILD_CORECLR)' != '1'">true</BuildDesktop>
+  </PropertyGroup>
+
   <Target Name="CollectProjects">
 
     <!-- product binaries -->
-
     <ItemGroup Condition="'$(BuildCompiler)' == 'true' OR '$(_RunningRestore)' == 'true'">
-      <Projects Include="$(MSBuildThisFileDirectory)src\fsharp\FSharp.Core\FSharp.Core.fsproj" />
-      <Projects Include="$(MSBuildThisFileDirectory)src\fsharp\FSharp.Build\FSharp.Build.fsproj" />
-      <Projects Include="$(MSBuildThisFileDirectory)src\fsharp\FSharp.Compiler.Private\FSharp.Compiler.Private.fsproj" />
-      <Projects Include="$(MSBuildThisFileDirectory)src\fsharp\FSharp.Compiler.Server.Shared\FSharp.Compiler.Server.Shared.fsproj" />
-      <Projects Include="$(MSBuildThisFileDirectory)src\fsharp\FSharp.Compiler.Interactive.Settings\FSharp.Compiler.Interactive.Settings.fsproj" />
-      <Projects Include="$(MSBuildThisFileDirectory)src\fsharp\fsc\fsc.fsproj" />
-      <Projects Include="$(MSBuildThisFileDirectory)src\fsharp\fsi\fsi.fsproj" />
-      <Projects Include="$(MSBuildThisFileDirectory)src\fsharp\fsiAnyCpu\fsiAnyCPU.fsproj" />
-
-      <NugetProjects Include="$(MSBuildThisFileDirectory)src\fsharp\FSharp.Compiler.nuget\Microsoft.FSharp.Compiler.csproj" />
+      <Projects Include="$(MSBuildThisFileDirectory)src\fsharp\FSharp.Core\FSharp.Core.fsproj">
+        <AdditionalProperties Condition="'$(BuildNetcore)' == 'true'">TargetFramework=netstandard1.6</AdditionalProperties>
+        <AdditionalProperties Condition="'$(BuildDesktop)' == 'true'">TargetFramework=net45</AdditionalProperties>
+      </Projects>
+      <Projects Include="$(MSBuildThisFileDirectory)src\fsharp\FSharp.Build\FSharp.Build.fsproj">
+        <AdditionalProperties Condition="'$(BuildNetcore)' == 'true'">TargetFramework=netstandard2.0</AdditionalProperties>
+        <AdditionalProperties Condition="'$(BuildDesktop)' == 'true'">TargetFramework=net46</AdditionalProperties>
+      </Projects>
+      <Projects Include="$(MSBuildThisFileDirectory)src\fsharp\FSharp.Compiler.Private\FSharp.Compiler.Private.fsproj">
+        <AdditionalProperties Condition="'$(BuildNetcore)' == 'true'">TargetFramework=netstandard1.6</AdditionalProperties>
+        <AdditionalProperties Condition="'$(BuildDesktop)' == 'true'">TargetFramework=net46</AdditionalProperties>
+      </Projects>
+      <Projects Include="$(MSBuildThisFileDirectory)src\fsharp\FSharp.Compiler.Server.Shared\FSharp.Compiler.Server.Shared.fsproj">
+        <AdditionalProperties Condition="'$(BuildDesktop)' == 'true'">TargetFramework=net46</AdditionalProperties>
+      </Projects>
+      <Projects Include="$(MSBuildThisFileDirectory)src\fsharp\FSharp.Compiler.Interactive.Settings\FSharp.Compiler.Interactive.Settings.fsproj">
+        <AdditionalProperties Condition="'$(BuildNetcore)' == 'true'">TargetFramework=netstandard1.6</AdditionalProperties>
+        <AdditionalProperties Condition="'$(BuildDesktop)' == 'true'">TargetFramework=net46</AdditionalProperties>
+      </Projects>
+      <Projects Include="$(MSBuildThisFileDirectory)src\fsharp\fsc\fsc.fsproj">
+        <AdditionalProperties Condition="'$(BuildNetcore)' == 'true'">TargetFramework=netcoreapp2.1</AdditionalProperties>
+        <AdditionalProperties Condition="'$(BuildDesktop)' == 'true'">TargetFramework=net46</AdditionalProperties>
+      </Projects>
+      <Projects Include="$(MSBuildThisFileDirectory)src\fsharp\fsi\fsi.fsproj">
+        <AdditionalProperties Condition="'$(BuildNetcore)' == 'true'">TargetFramework=netcoreapp2.1</AdditionalProperties>
+        <AdditionalProperties Condition="'$(BuildDesktop)' == 'true'">TargetFramework=net46</AdditionalProperties>
+      </Projects>
+      <Projects Include="$(MSBuildThisFileDirectory)src\fsharp\fsiAnyCpu\fsiAnyCPU.fsproj">
+        <AdditionalProperties Condition="'$(BuildDesktop)' == 'true'">TargetFramework=net46</AdditionalProperties>
+      </Projects>
     </ItemGroup>
 
     <ItemGroup Condition="'$(BuildVS)' == 'true' OR '$(_RunningRestore)' == 'true'">
@@ -70,6 +99,7 @@
     </ItemGroup>
 
     <ItemGroup Condition="'$(BuildSetup)' == 'true' OR '$(_RunningRestore)' == 'true'">
+      <NugetProjects Include="$(MSBuildThisFileDirectory)src\fsharp\FSharp.Compiler.nuget\Microsoft.FSharp.Compiler.csproj" />
       <Projects Include="$(MSBuildThisFileDirectory)setup\fsharp-setup-build.csproj" />
     </ItemGroup>
 
diff --git a/proto.proj b/proto.proj
index c3a704496ee..0974580af5a 100644
--- a/proto.proj
+++ b/proto.proj
@@ -7,8 +7,14 @@
 
   <ItemGroup>
     <Projects Include="src\buildtools\buildtools.proj" />
-    <Projects Include="src\fsharp\FSharp.Build\FSharp.Build.fsproj" />
-    <Projects Include="src\fsharp\fsc\fsc.fsproj" />
+    <Projects Include="src\fsharp\FSharp.Build\FSharp.Build.fsproj">
+      <AdditionalProperties Condition="'$(OS)' != 'Unix'">TargetFramework=net46</AdditionalProperties>
+      <AdditionalProperties Condition="'$(OS)' == 'Unix'">TargetFramework=netcoreapp2.1</AdditionalProperties>
+    </Projects>
+    <Projects Include="src\fsharp\fsc\fsc.fsproj">
+      <AdditionalProperties Condition="'$(OS)' != 'Unix'">TargetFramework=net46</AdditionalProperties>
+      <AdditionalProperties Condition="'$(OS)' == 'Unix'">TargetFramework=netcoreapp2.1</AdditionalProperties>
+    </Projects>
   </ItemGroup>
 
   <Target Name="Build">
diff --git a/src/fsharp/FSharp.Compiler.nuget/Microsoft.FSharp.Compiler.nuspec b/src/fsharp/FSharp.Compiler.nuget/Microsoft.FSharp.Compiler.nuspec
index 87ef49f5521..f10712a641e 100644
--- a/src/fsharp/FSharp.Compiler.nuget/Microsoft.FSharp.Compiler.nuspec
+++ b/src/fsharp/FSharp.Compiler.nuget/Microsoft.FSharp.Compiler.nuspec
@@ -55,14 +55,14 @@
         -->
         <!-- assemblies -->
         <file src="$artifactsbindir$\fsc\$configuration$\netcoreapp2.1\fsc.exe"                                                                    target="lib\netcoreapp2.1" />
-        <file src="$artifactsbindir$\fsi\$configuration$\netcoreapp2.0\fsi.exe"                                                                    target="lib\netcoreapp2.1" />
+        <file src="$artifactsbindir$\fsi\$configuration$\netcoreapp2.1\fsi.exe"                                                                    target="lib\netcoreapp2.1" />
         <file src="$artifactsbindir$\FSharp.Core\$configuration$\netstandard1.6\FSharp.Core.dll"                                                   target="lib\netcoreapp2.1" />
         <file src="$artifactsbindir$\FSharp.Compiler.Private\$configuration$\netstandard1.6\FSharp.Compiler.Private.dll"                           target="lib\netcoreapp2.1" />
         <file src="$artifactsbindir$\FSharp.Build\$configuration$\netstandard2.0\FSharp.Build.dll"                                                 target="lib\netcoreapp2.1" />
         <file src="$artifactsbindir$\FSharp.Compiler.Interactive.Settings\$configuration$\netstandard1.6\FSharp.Compiler.Interactive.Settings.dll" target="lib\netcoreapp2.1" />
         <!-- symbols -->
         <file src="$artifactsbindir$\fsc\$configuration$\netcoreapp2.1\fsc.pdb"                                                                    target="lib\netcoreapp2.1" />
-        <file src="$artifactsbindir$\fsi\$configuration$\netcoreapp2.0\fsi.pdb"                                                                    target="lib\netcoreapp2.1" />
+        <file src="$artifactsbindir$\fsi\$configuration$\netcoreapp2.1\fsi.pdb"                                                                    target="lib\netcoreapp2.1" />
         <file src="$artifactsbindir$\FSharp.Core\$configuration$\netstandard1.6\FSharp.Core.pdb"                                                   target="lib\netcoreapp2.1" />
         <file src="$artifactsbindir$\FSharp.Compiler.Private\$configuration$\netstandard1.6\FSharp.Compiler.Private.pdb"                           target="lib\netcoreapp2.1" />
         <file src="$artifactsbindir$\FSharp.Build\$configuration$\netstandard2.0\FSharp.Build.pdb"                                                 target="lib\netcoreapp2.1" />
diff --git a/src/fsharp/fsc/fsc.fsproj b/src/fsharp/fsc/fsc.fsproj
index 4bc9770e9e0..40f56a0627e 100644
--- a/src/fsharp/fsc/fsc.fsproj
+++ b/src/fsharp/fsc/fsc.fsproj
@@ -12,6 +12,7 @@
     <OtherFlags>$(OtherFlags) --maxerrors:20 --extraoptimizationloops:1</OtherFlags>
     <UseFSharpProductVersion>true</UseFSharpProductVersion>
     <UseAssetTargetFallback>true</UseAssetTargetFallback>
+    <NGenBinary>true</NGenBinary>
   </PropertyGroup>
 
   <ItemGroup>
diff --git a/src/fsharp/fsi/fsi.fsproj b/src/fsharp/fsi/fsi.fsproj
index 6a4b7df15d5..5dbcac7557e 100644
--- a/src/fsharp/fsi/fsi.fsproj
+++ b/src/fsharp/fsi/fsi.fsproj
@@ -4,7 +4,7 @@
 
   <PropertyGroup>
     <OutputType>Exe</OutputType>
-    <TargetFrameworks>net46;netcoreapp2.0</TargetFrameworks>
+    <TargetFrameworks>net46;netcoreapp2.1</TargetFrameworks>
     <TargetExt>.exe</TargetExt>
     <AssemblyName>fsi</AssemblyName>
     <NoWarn>$(NoWarn);45;55;62;75;1204</NoWarn>
@@ -13,6 +13,7 @@
     <Win32Resource>fsi.res</Win32Resource>
     <UseFSharpProductVersion>true</UseFSharpProductVersion>
     <UseAssetTargetFallback>true</UseAssetTargetFallback>
+    <NGenBinary>true</NGenBinary>
   </PropertyGroup>
 
   <PropertyGroup Condition="'$(TargetFramework)' == 'net46'">
@@ -45,7 +46,7 @@
     <Reference Include="WindowsBase" />
   </ItemGroup>
 
-  <ItemGroup Condition="'$(TargetFramework)' == 'netcoreapp2.0'">
+  <ItemGroup Condition="'$(TargetFramework)' == 'netcoreapp2.1'">
     <PackageReference Include="System.Diagnostics.Process" Version="$(SystemDiagnosticsProcessPackageVersion)" />
     <PackageReference Include="System.Linq.Expressions" Version="$(SystemLinqExpressionsPackageVersion)" />
     <PackageReference Include="System.Reflection.Emit" Version="$(SystemReflectionEmitPackageVersion)" />
diff --git a/tests/fsharp/test-framework.fs b/tests/fsharp/test-framework.fs
index 85bc6319f19..85d462ffe47 100644
--- a/tests/fsharp/test-framework.fs
+++ b/tests/fsharp/test-framework.fs
@@ -164,7 +164,7 @@ let config configurationName envVars =
     let fsharpCompilerInteractiveSettingsArchitecture = "net46"
 #else
     let fscArchitecture = "netcoreapp2.1"
-    let fsiArchitecture = "netcoreapp2.0"
+    let fsiArchitecture = "netcoreapp2.1"
     let fsharpCoreArchitecture = "netstandard1.6"
     let fsharpBuildArchitecture = "netstandard2.0"
     let fsharpCompilerInteractiveSettingsArchitecture = "netstandard1.6"