Not able to compile Youtube API

Hi,

I'm trying to compile an app making use of the proper Youtube API v3 now that there is "support" for 4.5+
But upon importing the dll files (I'm using the .Net 4.5 pre-built ones from the Nuget package), I get the following

Google.Apis - OK
Google.Apis.Core - Warning:

SpritePacker failed to get types from Google.Apis.Core, Version=1.19.0.0, Culture=neutral, PublicKeyToken=4b01fa6e34db77ab. Error: The classes in the module cannot be loaded.
UnityEditor.Sprites.Packer:GetSelectedPolicyId()​

Google.Apis.PlatformServices - Warning:

SpritePacker failed to get types from Google.Apis.PlatformServices, Version=1.19.0.0, Culture=neutral, PublicKeyToken=4b01fa6e34db77ab. Error: The classes in the module cannot be loaded.
UnityEditor.Sprites.Packer:GetSelectedPolicyId()​

Google.Apis.YouTube.v3 - OK
Google.Apis.Auth - OK
Google.Apis.Auth.PlatformServices - Blocking compiler errors :

FileNotFoundException: Could not load file or assembly or one of its dependencies.
System.Reflection.MonoMethodInfo.GetMethodInfo (System.IntPtr handle) (at /Users/builduser/buildslave/mono/build/mcs/class/corlib/System.Reflection/MonoMethod.cs:67)
System.Reflection.MonoMethod.GetPseudoCustomAttributes () (at /Users/builduser/buildslave/mono/build/mcs/class/corlib/System.Reflection/MonoMethod.cs:405)
System.MonoCustomAttrs.GetPseudoCustomAttributes (System.Reflection.ICustomAttributeProvider obj, System.Type attributeType) (at /Users/builduser/buildslave/mono/build/mcs/class/corlib/System/MonoCustomAttrs.cs:77)
System.MonoCustomAttrs.IsDefined (System.Reflection.ICustomAttributeProvider obj, System.Type attributeType, System.Boolean inherit) (at /Users/builduser/buildslave/mono/build/mcs/class/corlib/System/MonoCustomAttrs.cs:320)
System.Reflection.MonoMethod.IsDefined (System.Type attributeType, System.Boolean inherit) (at /Users/builduser/buildslave/mono/build/mcs/class/corlib/System.Reflection/MonoMethod.cs:386)
System.Attribute.IsDefined (System.Reflection.MemberInfo element, System.Type attributeType, System.Boolean inherit) (at /Users/builduser/buildslave/mono/build/mcs/class/referencesource/mscorlib/system/attribute.cs:627)
System.Attribute.IsDefined (System.Reflection.MemberInfo element, System.Type attributeType) (at /Users/builduser/buildslave/mono/build/mcs/class/referencesource/mscorlib/system/attribute.cs:602)
UnityEditor.EditorAssemblies.ProcessStaticMethodAttributes (System.Type type) (at C:/buildslave/unity/build/Editor/Mono/EditorAssemblies.cs:95)
UnityEditor.EditorAssemblies.ProcessInitializeOnLoadAttributes () (at C:/buildslave/unity/build/Editor/Mono/EditorAssemblies.cs:158)
UnityEditor.EditorAssembliesrocessInitializeOnLoadAttributes()​

Then​

Unloading broken assembly Assets/GoogleAPIs/Google.Apis.Auth.PlatformServices.dll, this assembly can cause crashes in the runtime
​

The Google.Apis.* requirement is due to the need of getting an OAuth2 token for user specific functionality.

Note that I've tried the .Net Standard 1.3 versions of the packages too and these give these errors:

Assets/Test.cs(48,7): error CS0012: The type `System.Object' is defined in an assembly that is not referenced. Consider adding a reference to assembly `System.Runtime, Version=4.0.20.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a'

Assets/Test.cs(63,32): error CS0012: The type `System.IDisposable' is defined in an assembly that is not referenced. Consider adding a reference to assembly `System.Runtime, Version=4.0.20.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a'
​

I've tried to create a mcs.rsp with content -r:System.Runtime, but that did not work. Error:

error CS0006: Metadata file `System.Runtime' could not be found
​

In all cases .Net Standard libraries would not help in my case because I cannot find any Google.Apis.Auth.PlatformServices for it and therefore no GoogleWebAuthorizationBroker available to get the token in the first place.

Is there anything I can do from my side ? (Mostly on the 4.5 front)

PS: Also for note and to be explicit, this is on a new project, no specific code added yet, just drag&drop of dlls to the project. API Compatibility Level was set to .Net 4.6 in "Project Settings > Player"

Packages used:
https://www.nuget.org/packages/Google.Apis/
https://www.nuget.org/packages/Google.Apis.Core/
https://www.nuget.org/packages/Google.Apis.Auth/
https://www.nuget.org/packages/Google.Apis.YouTube.v3/​

 

very similar to mine https://fogbugz.unity3d.com/default.asp?867319_hdrna14p16a9bqt9
(same exception in the log)