fix to build

build.cmd

@@ -26,6 +26,8 @@ exit /b 1
 
 :ARGUMENTS_OK
 
+set BUILD_PROTO_WITH_CORECLR_LKG=1
+
 set BUILD_PROTO=0
 set BUILD_NET40=1
 set BUILD_CORECLR=0
@@ -100,6 +102,11 @@ if /i '%ARG%' == 'all' (
     set SKIP_EXPENSIVE_TESTS=0
 )
 
+if /i '%ARG%' == 'protofx' (
+    set BUILD_PROTO_WITH_CORECLR_LKG=0
+    set BUILD_PROTO=1
+)
+
 if /i '%ARG%' == 'microbuild' (
     set BUILD_PROTO=1
     set BUILD_NET40=1
@@ -257,6 +264,7 @@ REM after this point, ARG variable should not be used, use only BUILD_* or TEST_
 echo Build/Tests configuration:
 echo.
 echo BUILD_PROTO=%BUILD_PROTO%
+echo BUILD_PROTO_WITH_CORECLR_LKG=%BUILD_PROTO_WITH_CORECLR_LKG%
 echo BUILD_NET40=%BUILD_NET40%
 echo BUILD_CORECLR=%BUILD_CORECLR%
 echo BUILD_PORTABLE=%BUILD_PORTABLE%
@@ -327,7 +335,7 @@ if '%RestorePackages%' == 'true' (
     .\.nuget\NuGet.exe restore packages.config -PackagesDirectory packages -ConfigFile .nuget\nuget.config
     @if ERRORLEVEL 1 echo Error: Nuget restore failed  && goto :failure
 )
-if '%BUILD_CORECLR%' == '1' (
+if '%BUILD_PROTO_WITH_CORECLR_LKG%' == '1' (
 
     :: Restore the Tools directory
     call %~dp0init-tools.cmd
@@ -358,6 +366,11 @@ if '%BUILD_CORECLR%' == '1' (
     popd
 
 )
+if '%BUILD_PROTO_WITH_CORECLR_LKG%' == '0' (
+    %_msbuildexe% %msbuildflags% src\fsharp-proto-build.proj %BUILD_DIAG%
+    @if ERRORLEVEL 1 echo Error: '%_msbuildexe% %msbuildflags% src\fsharp-proto-build.proj %BUILD_DIAG%' failed && goto :failure
+)
+
 rem copy targestfile into tools directory ... temporary fix until packaging complete.
 copy src\fsharp\FSharp.Build\Microsoft.FSharp.targets tools\Microsoft.FSharp.targets
 copy src\fsharp\FSharp.Build\Microsoft.Portable.FSharp.targets tools\Microsoft.Portable.FSharp.targets

src/FSharpSource.targets

@@ -739,12 +739,25 @@
 
   <Choose>
     <When Condition="'$(BuildWith)' == 'LKG'">
-      <PropertyGroup>
-         <FSharpTargetsPath>..\lkg\FSharp-$(LkgVersion)\bin\Microsoft.FSharp.Targets</FSharpTargetsPath>
-         <FscToolPath>$(FSharpSourcesRoot)\..\lkg\bin\Debug\netstandard1.6\win7-x64\publish</FscToolPath>
-         <FSLKGPath>$(FSharpSourcesRoot)\..\lkg\FSharp-$(LkgVersion)\bin</FSLKGPath>
-         <FSCoreLKGPath>$(FSLKGPath)\FSharp.Core.dll</FSCoreLKGPath>
-      </PropertyGroup>
+      <Choose>
+        <When Condition="Exists('$(FSharpSourcesRoot)\..\lkg\bin\Debug\netstandard1.6\win7-x64\publish\fsc.exe')">
+          <PropertyGroup >
+            <FSharpTargetsPath>$(FSharpSourcesRoot)\..\lkg\FSharp-$(LkgVersion)\bin\Microsoft.FSharp.Targets</FSharpTargetsPath>
+            <FscToolPath>$(FSharpSourcesRoot)\..\lkg\bin\Debug\netstandard1.6\win7-x64\publish</FscToolPath>
+            <FSLKGPath>$(FSharpSourcesRoot)\..\lkg\FSharp-$(LkgVersion)\bin</FSLKGPath>
+            <FSCoreLKGPath>$(FSLKGPath)\FSharp.Core.dll</FSCoreLKGPath>
+          </PropertyGroup>
+        </When>
+        <Otherwise>
+          <PropertyGroup >
+            <FSharpTargetsPath>..\lkg\FSharp-$(LkgVersion)\bin\Microsoft.FSharp.Targets</FSharpTargetsPath>
+            <FscToolPath>$(FSharpSourcesRoot)\..\lkg\FSharp-$(LkgVersion)\bin</FscToolPath>
+            <FSLKGPath>$(FSharpSourcesRoot)\..\lkg\FSharp-$(LkgVersion)\bin</FSLKGPath>
+            <FSCoreLKGPath>$(FSLKGPath)\FSharp.Core.dll</FSCoreLKGPath>
+          </PropertyGroup>
+        </Otherwise>
+      </Choose>
+		
     </When>
     <When Condition="'$(TargetFramework)'=='portable47' OR '$(TargetFramework)'=='portable7' OR '$(TargetFramework)'=='portable78' OR '$(TargetFramework)'=='portable259' OR '$(TargetFramework)'=='coreclr'">
       <PropertyGroup>