diff --git a/.gitignore b/.gitignore
index 133aa1231be..1a7e530e494 100644
--- a/.gitignore
+++ b/.gitignore
@@ -118,3 +118,6 @@ source_link.json
 /VSRelease/net40/bin
 System.ValueTuple.dll
 tests/fsharpqa/testenv/bin/System.ValueTuple.dll
+*/.fake
+/fcs/packages/
+*/paket-files/
diff --git a/fcs/.paket/Paket.Restore.targets b/fcs/.paket/Paket.Restore.targets
new file mode 100644
index 00000000000..67f745a3671
--- /dev/null
+++ b/fcs/.paket/Paket.Restore.targets
@@ -0,0 +1,225 @@
+<Project xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
+  <!-- Prevent dotnet template engine to parse this file -->
+  <!--/-:cnd:noEmit-->
+  <PropertyGroup>
+    <!-- make MSBuild track this file for incremental builds. -->
+    <!-- ref https://blogs.msdn.microsoft.com/msbuild/2005/09/26/how-to-ensure-changes-to-a-custom-target-file-prompt-a-rebuild/ -->
+    <MSBuildAllProjects>$(MSBuildAllProjects);$(MSBuildThisFileFullPath)</MSBuildAllProjects>
+    <!-- Mark that this target file has been loaded.  -->
+    <IsPaketRestoreTargetsFileLoaded>true</IsPaketRestoreTargetsFileLoaded>
+    <PaketToolsPath>$(MSBuildThisFileDirectory)</PaketToolsPath>
+    <PaketRootPath>$(MSBuildThisFileDirectory)..\</PaketRootPath>
+    <PaketRestoreCacheFile>$(PaketRootPath)paket-files\paket.restore.cached</PaketRestoreCacheFile>
+    <PaketLockFilePath>$(PaketRootPath)paket.lock</PaketLockFilePath>
+    <MonoPath Condition="'$(MonoPath)' == '' And Exists('/Library/Frameworks/Mono.framework/Commands/mono')">/Library/Frameworks/Mono.framework/Commands/mono</MonoPath>
+    <MonoPath Condition="'$(MonoPath)' == ''">mono</MonoPath>
+    <!-- Paket command -->
+    <PaketExePath Condition=" '$(PaketExePath)' == '' AND Exists('$(PaketRootPath)paket.exe')">$(PaketRootPath)paket.exe</PaketExePath>
+    <PaketExePath Condition=" '$(PaketExePath)' == '' ">$(PaketToolsPath)paket.exe</PaketExePath>
+    <PaketCommand Condition=" '$(OS)' == 'Windows_NT'">"$(PaketExePath)"</PaketCommand>
+    <PaketCommand Condition=" '$(OS)' != 'Windows_NT' ">$(MonoPath) --runtime=v4.0.30319 "$(PaketExePath)"</PaketCommand>
+    <PaketBootStrapperExePath Condition=" '$(PaketBootStrapperExePath)' == '' AND Exists('$(PaketRootPath)paket.bootstrapper.exe')">$(PaketRootPath)paket.bootstrapper.exe</PaketBootStrapperExePath>
+    <PaketBootStrapperExePath Condition=" '$(PaketBootStrapperExePath)' == '' ">$(PaketToolsPath)paket.bootstrapper.exe</PaketBootStrapperExePath>
+    <PaketBootStrapperCommand Condition=" '$(OS)' == 'Windows_NT'">"$(PaketBootStrapperExePath)"</PaketBootStrapperCommand>
+    <PaketBootStrapperCommand Condition=" '$(OS)' != 'Windows_NT' ">$(MonoPath) --runtime=v4.0.30319 "$(PaketBootStrapperExePath)"</PaketBootStrapperCommand>
+
+    <!-- Disable automagic references for F# dotnet sdk -->
+    <!-- This will not do anything for other project types -->
+    <!-- see https://github.com/fsharp/fslang-design/blob/master/RFCs/FS-1032-fsharp-in-dotnet-sdk.md -->
+    <DisableImplicitFSharpCoreReference>true</DisableImplicitFSharpCoreReference>
+    <DisableImplicitSystemValueTupleReference>true</DisableImplicitSystemValueTupleReference>
+  </PropertyGroup>
+
+  <Target Name="PaketRestore" BeforeTargets="_GenerateProjectRestoreGraphPerFramework;_GenerateRestoreGraphWalkPerFramework;CollectPackageReferences" >
+
+    <!-- Step 1 Check if lockfile is properly restored -->
+    <PropertyGroup>
+      <PaketRestoreRequired>true</PaketRestoreRequired>
+      <NoWarn>$(NoWarn);NU1603</NoWarn>
+    </PropertyGroup>
+
+    <PropertyGroup Condition="Exists('$(PaketRestoreCacheFile)') ">
+      <PaketRestoreCachedHash>$([System.IO.File]::ReadAllText('$(PaketRestoreCacheFile)'))</PaketRestoreCachedHash>
+      <PaketRestoreLockFileHash>$([System.IO.File]::ReadAllText('$(PaketLockFilePath)'))</PaketRestoreLockFileHash>
+      <PaketRestoreRequired>true</PaketRestoreRequired>
+      <PaketRestoreRequired Condition=" '$(PaketRestoreLockFileHash)' == '$(PaketRestoreCachedHash)' ">false</PaketRestoreRequired>
+      <PaketRestoreRequired Condition=" '$(PaketRestoreLockFileHash)' == '' ">true</PaketRestoreRequired>
+    </PropertyGroup>
+
+    <!-- Do a global restore if required -->
+    <Exec Command='$(PaketBootStrapperCommand)' Condition="Exists('$(PaketBootStrapperExePath)') AND !(Exists('$(PaketExePath)'))" ContinueOnError="false" />
+    <Exec Command='$(PaketCommand) restore' Condition=" '$(PaketRestoreRequired)' == 'true' " ContinueOnError="false" />
+
+    <!-- Step 2 Detect project specific changes -->
+    <PropertyGroup>
+      <PaketReferencesCachedFilePath>$(MSBuildProjectDirectory)\obj\$(MSBuildProjectFile).paket.references.cached</PaketReferencesCachedFilePath>
+      <!-- MyProject.fsproj.paket.references has the highest precedence -->
+      <PaketOriginalReferencesFilePath>$(MSBuildProjectFullPath).paket.references</PaketOriginalReferencesFilePath>
+      <!-- MyProject.paket.references -->
+      <PaketOriginalReferencesFilePath Condition=" !Exists('$(PaketOriginalReferencesFilePath)')">$(MSBuildProjectDirectory)\$(MSBuildProjectName).paket.references</PaketOriginalReferencesFilePath>
+      <!-- paket.references -->
+      <PaketOriginalReferencesFilePath Condition=" !Exists('$(PaketOriginalReferencesFilePath)')">$(MSBuildProjectDirectory)\paket.references</PaketOriginalReferencesFilePath>
+      <PaketResolvedFilePath>$(MSBuildProjectDirectory)\obj\$(MSBuildProjectFile).$(TargetFramework).paket.resolved</PaketResolvedFilePath>
+      <PaketRestoreRequired>true</PaketRestoreRequired>
+      <PaketRestoreRequiredReason>references-file-or-cache-not-found</PaketRestoreRequiredReason>
+    </PropertyGroup>
+
+    <!-- Step 2 a Detect changes in references file -->
+    <PropertyGroup Condition="Exists('$(PaketOriginalReferencesFilePath)') AND Exists('$(PaketReferencesCachedFilePath)') ">
+      <PaketRestoreCachedHash>$([System.IO.File]::ReadAllText('$(PaketReferencesCachedFilePath)'))</PaketRestoreCachedHash>
+      <PaketRestoreReferencesFileHash>$([System.IO.File]::ReadAllText('$(PaketOriginalReferencesFilePath)'))</PaketRestoreReferencesFileHash>
+      <PaketRestoreRequiredReason>references-file</PaketRestoreRequiredReason>
+      <PaketRestoreRequired Condition=" '$(PaketRestoreReferencesFileHash)' == '$(PaketRestoreCachedHash)' ">false</PaketRestoreRequired>
+    </PropertyGroup>
+
+    <PropertyGroup Condition="!Exists('$(PaketOriginalReferencesFilePath)') AND !Exists('$(PaketReferencesCachedFilePath)') ">
+      <!-- If both don't exist there is nothing to do. -->
+      <PaketRestoreRequired>false</PaketRestoreRequired>
+    </PropertyGroup>
+
+    <!-- Step 2 b detect relevant changes in project file (new targetframework) -->
+    <PropertyGroup Condition=" !Exists('$(PaketResolvedFilePath)') AND '$(TargetFramework)' != '' ">
+      <PaketRestoreRequired>true</PaketRestoreRequired>
+      <PaketRestoreRequiredReason>target-framework '$(TargetFramework)'</PaketRestoreRequiredReason>
+    </PropertyGroup>
+
+    <!-- Step 3 Restore project specific stuff if required -->
+    <Message Condition=" '$(PaketRestoreRequired)' == 'true' " Importance="low" Text="Detected a change ('$(PaketRestoreRequiredReason)') in the project file '$(MSBuildProjectFullPath)', calling paket restore" />
+    <Exec Command='$(PaketCommand) restore --project "$(MSBuildProjectFullPath)"' Condition=" '$(PaketRestoreRequired)' == 'true' " ContinueOnError="false" />
+
+    <!-- This shouldn't actually happen, but just to be sure. -->
+    <Error Condition=" !Exists('$(PaketResolvedFilePath)') AND '$(TargetFramework)' != '' " Text="A paket file for the framework '$(TargetFramework)' is missing. Please delete 'paket-files/paket.restore.cached' and call 'paket restore'." />
+
+    <!-- Step 4 forward all msbuild properties (PackageReference, DotNetCliToolReference) to msbuild -->
+    <ReadLinesFromFile Condition="Exists('$(PaketResolvedFilePath)')" File="$(PaketResolvedFilePath)" >
+      <Output TaskParameter="Lines" ItemName="PaketReferencesFileLines"/>
+    </ReadLinesFromFile>
+
+    <ItemGroup Condition=" Exists('$(PaketResolvedFilePath)') AND '@(PaketReferencesFileLines)' != '' " >
+      <PaketReferencesFileLinesInfo Include="@(PaketReferencesFileLines)" >
+        <PackageName>$([System.String]::Copy('%(PaketReferencesFileLines.Identity)').Split(',')[0])</PackageName>
+        <PackageVersion>$([System.String]::Copy('%(PaketReferencesFileLines.Identity)').Split(',')[1])</PackageVersion>
+      </PaketReferencesFileLinesInfo>
+      <PackageReference Include="%(PaketReferencesFileLinesInfo.PackageName)">
+        <Version>%(PaketReferencesFileLinesInfo.PackageVersion)</Version>
+      </PackageReference>
+    </ItemGroup>
+
+    <PropertyGroup>
+      <RestoreConfigFile>$(MSBuildProjectDirectory)/obj/$(MSBuildProjectFile).NuGet.Config</RestoreConfigFile>
+    </PropertyGroup>
+
+  </Target>
+
+  <Target Name="PaketDisableDirectPack" AfterTargets="_IntermediatePack" BeforeTargets="GenerateNuspec" Condition="('$(IsPackable)' == '' Or '$(IsPackable)' == 'true') And Exists('$(MSBuildProjectDirectory)/obj/$(MSBuildProjectFile).references')" >
+    <PropertyGroup>
+      <ContinuePackingAfterGeneratingNuspec>false</ContinuePackingAfterGeneratingNuspec>
+    </PropertyGroup>
+  </Target>
+
+  <Target Name="PaketOverrideNuspec" AfterTargets="GenerateNuspec" Condition="('$(IsPackable)' == '' Or '$(IsPackable)' == 'true') And Exists('$(MSBuildProjectDirectory)/obj/$(MSBuildProjectFile).references')" >
+    <PropertyGroup>
+      <PaketProjectFile>$(MSBuildProjectDirectory)/$(MSBuildProjectFile)</PaketProjectFile>
+      <ContinuePackingAfterGeneratingNuspec>true</ContinuePackingAfterGeneratingNuspec>
+      <UseNewPack>false</UseNewPack>
+      <UseNewPack Condition=" '$(NuGetToolVersion)' != '4.0.0' ">true</UseNewPack>
+    </PropertyGroup>
+
+    <ItemGroup>
+      <_NuspecFiles Include="$(BaseIntermediateOutputPath)*.nuspec"/>
+    </ItemGroup>
+
+    <Exec Command='$(PaketCommand) fix-nuspecs files "@(_NuspecFiles)" project-file "$(PaketProjectFile)" ' Condition="@(_NuspecFiles) != ''" />
+
+    <ConvertToAbsolutePath Condition="@(_NuspecFiles) != ''" Paths="@(_NuspecFiles)">
+      <Output TaskParameter="AbsolutePaths" PropertyName="NuspecFileAbsolutePath" />
+    </ConvertToAbsolutePath>
+
+    <!-- Call Pack -->
+    <PackTask Condition="$(UseNewPack)"
+              PackItem="$(PackProjectInputFile)"
+              PackageFiles="@(_PackageFiles)"
+              PackageFilesToExclude="@(_PackageFilesToExclude)"
+              PackageVersion="$(PackageVersion)"
+              PackageId="$(PackageId)"
+              Title="$(Title)"
+              Authors="$(Authors)"
+              Description="$(Description)"
+              Copyright="$(Copyright)"
+              RequireLicenseAcceptance="$(PackageRequireLicenseAcceptance)"
+              LicenseUrl="$(PackageLicenseUrl)"
+              ProjectUrl="$(PackageProjectUrl)"
+              IconUrl="$(PackageIconUrl)"
+              ReleaseNotes="$(PackageReleaseNotes)"
+              Tags="$(PackageTags)"
+              DevelopmentDependency="$(DevelopmentDependency)"
+              BuildOutputInPackage="@(_BuildOutputInPackage)"
+              TargetPathsToSymbols="@(_TargetPathsToSymbols)"
+              TargetFrameworks="@(_TargetFrameworks)"
+              AssemblyName="$(AssemblyName)"
+              PackageOutputPath="$(PackageOutputAbsolutePath)"
+              IncludeSymbols="$(IncludeSymbols)"
+              IncludeSource="$(IncludeSource)"
+              PackageTypes="$(PackageType)"
+              IsTool="$(IsTool)"
+              RepositoryUrl="$(RepositoryUrl)"
+              RepositoryType="$(RepositoryType)"
+              SourceFiles="@(_SourceFiles->Distinct())"
+              NoPackageAnalysis="$(NoPackageAnalysis)"
+              MinClientVersion="$(MinClientVersion)"
+              Serviceable="$(Serviceable)"
+              FrameworkAssemblyReferences="@(_FrameworkAssemblyReferences)"
+              ContinuePackingAfterGeneratingNuspec="$(ContinuePackingAfterGeneratingNuspec)"
+              NuspecOutputPath="$(BaseIntermediateOutputPath)"
+              IncludeBuildOutput="$(IncludeBuildOutput)"
+              BuildOutputFolder="$(BuildOutputTargetFolder)"
+              ContentTargetFolders="$(ContentTargetFolders)"
+              RestoreOutputPath="$(RestoreOutputAbsolutePath)"
+              NuspecFile="$(NuspecFileAbsolutePath)"
+              NuspecBasePath="$(NuspecBasePath)"
+              NuspecProperties="$(NuspecProperties)"/>
+
+    <PackTask Condition="! $(UseNewPack)"
+              PackItem="$(PackProjectInputFile)"
+              PackageFiles="@(_PackageFiles)"
+              PackageFilesToExclude="@(_PackageFilesToExclude)"
+              PackageVersion="$(PackageVersion)"
+              PackageId="$(PackageId)"
+              Title="$(Title)"
+              Authors="$(Authors)"
+              Description="$(Description)"
+              Copyright="$(Copyright)"
+              RequireLicenseAcceptance="$(PackageRequireLicenseAcceptance)"
+              LicenseUrl="$(PackageLicenseUrl)"
+              ProjectUrl="$(PackageProjectUrl)"
+              IconUrl="$(PackageIconUrl)"
+              ReleaseNotes="$(PackageReleaseNotes)"
+              Tags="$(PackageTags)"
+              TargetPathsToAssemblies="@(_TargetPathsToAssemblies->'%(FinalOutputPath)')"
+              TargetPathsToSymbols="@(_TargetPathsToSymbols)"
+              TargetFrameworks="@(_TargetFrameworks)"
+              AssemblyName="$(AssemblyName)"
+              PackageOutputPath="$(PackageOutputAbsolutePath)"
+              IncludeSymbols="$(IncludeSymbols)"
+              IncludeSource="$(IncludeSource)"
+              PackageTypes="$(PackageType)"
+              IsTool="$(IsTool)"
+              RepositoryUrl="$(RepositoryUrl)"
+              RepositoryType="$(RepositoryType)"
+              SourceFiles="@(_SourceFiles->Distinct())"
+              NoPackageAnalysis="$(NoPackageAnalysis)"
+              MinClientVersion="$(MinClientVersion)"
+              Serviceable="$(Serviceable)"
+              AssemblyReferences="@(_References)"
+              ContinuePackingAfterGeneratingNuspec="$(ContinuePackingAfterGeneratingNuspec)"
+              NuspecOutputPath="$(BaseIntermediateOutputPath)"
+              IncludeBuildOutput="$(IncludeBuildOutput)"
+              BuildOutputFolder="$(BuildOutputTargetFolder)"
+              ContentTargetFolders="$(ContentTargetFolders)"
+              RestoreOutputPath="$(RestoreOutputAbsolutePath)"
+              NuspecFile="$(NuspecFileAbsolutePath)"
+              NuspecBasePath="$(NuspecBasePath)"
+              NuspecProperties="$(NuspecProperties)"/>
+  </Target>
+  <!--/+:cnd:noEmit-->
+</Project>
diff --git a/fcs/.paket/paket.bootstrapper.exe b/fcs/.paket/paket.bootstrapper.exe
deleted file mode 100644
index 64fdf248bfc..00000000000
Binary files a/fcs/.paket/paket.bootstrapper.exe and /dev/null differ
diff --git a/fcs/.paket/paket.exe b/fcs/.paket/paket.exe
new file mode 100644
index 00000000000..ef3ea32af2a
Binary files /dev/null and b/fcs/.paket/paket.exe differ
diff --git a/fcs/build.cmd b/fcs/build.cmd
index 312c7ed7382..163dd456347 100644
--- a/fcs/build.cmd
+++ b/fcs/build.cmd
@@ -2,7 +2,7 @@
 .nuget\NuGet.exe restore -PackagesDirectory packages
 setlocal
 cd fcs
-.paket\paket.bootstrapper.exe
+
 dotnet restore tools.fsproj
 if errorlevel 1 (
   endlocal
diff --git a/fcs/build.sh b/fcs/build.sh
index 3e7e80e7d88..f0107dfdafe 100644
--- a/fcs/build.sh
+++ b/fcs/build.sh
@@ -15,12 +15,6 @@ else
   
   dotnet restore tools.fsproj
 
-  mono .paket/paket.bootstrapper.exe
-  exit_code=$?
-  if [ $exit_code -ne 0 ]; then
-    exit $exit_code
-  fi
-
   mono .paket/paket.exe restore
   exit_code=$?
   if [ $exit_code -ne 0 ]; then
diff --git a/netci.groovy b/netci.groovy
index ba971aaf9c4..653514e3c0c 100644
--- a/netci.groovy
+++ b/netci.groovy
@@ -12,7 +12,7 @@ def static getBuildJobName(def configuration, def os) {
 
 [true, false].each { isPullRequest ->
     osList.each { os ->
-        def configurations = ['Debug', 'Release_ci_part1', 'Release_ci_part2', 'Release_ci_part3', 'Release_net40_no_vs' ];
+        def configurations = ['Debug', 'Release_ci_part1', 'Release_ci_part2', 'Release_ci_part3', 'Release_net40_no_vs', 'Release_fcs' ];
         if (os != 'Windows_NT') {
             // Only build one configuration on Linux/... so far
             configurations = ['Release'];
@@ -24,10 +24,27 @@ def static getBuildJobName(def configuration, def os) {
             // Calculate job name
             def jobName = getBuildJobName(configuration, os)
 
+            def buildPath = '';
+            if (os == 'Windows_NT') {
+                buildPath = ".\\"
+            }
+            else {
+                buildPath = "./"
+            }
             def buildCommand = '';
-
             def buildFlavor= '';
-            if (configuration == "Debug") {
+
+            if (configuration == "Release_fcs") {
+                if (os == 'Windows_NT') {
+                    buildPath = ".\\fcs\\"
+                }
+                else {
+                    buildPath = "./fcs/"
+                }
+                buildFlavor = ""
+                build_args = "TestAndNuget"
+            }
+            else if (configuration == "Debug") {
                 buildFlavor = "debug"
                 build_args = ""
             }
@@ -51,10 +68,10 @@ def static getBuildJobName(def configuration, def os) {
             }
 
             if (os == 'Windows_NT') {
-                buildCommand = ".\\build.cmd ${buildFlavor} ${build_args}"
+                buildCommand = "${buildPath}build.cmd ${buildFlavor} ${build_args}"
             }
             else {
-                buildCommand = "./build.sh ${buildFlavor} ${build_args}"
+                buildCommand = "${buildPath}build.sh ${buildFlavor} ${build_args}"
             }
 
             def newJobName = Utilities.getFullJobName(project, jobName, isPullRequest)
@@ -64,7 +81,7 @@ def static getBuildJobName(def configuration, def os) {
                         batchFile("""
 echo *** Build Visual F# Tools ***
 
-.\\build.cmd ${buildFlavor} ${build_args}""")
+${buildPath}build.cmd ${buildFlavor} ${build_args}""")
                     }
                     else {
                         // Shell