No need for the explicit reference to NetFx configuration, it inherits it from nhibernate as for Std builds.

Author: fredericDelaporte

CoreMemoryCache/NHibernate.Caches.CoreMemoryCache/NHibernate.Caches.CoreMemoryCache.csproj

@@ -24,9 +24,6 @@
     <PackageReference Include="Microsoft.Extensions.Caching.Memory" Version="2.0.0" />
     <PackageReference Include="NHibernate" Version="5.1.0" />
   </ItemGroup>
-  <ItemGroup Condition="'$(TargetFramework)' == 'net461'">
-    <Reference Include="System.Configuration" />
-  </ItemGroup>
   <ItemGroup>
     <Content Include="../../readme.md">
       <PackagePath>./NHibernate.Caches.readme.md</PackagePath>