The testsuite fails to build with

1>SocketsTestSuite.obj : error LNK2019: unresolved external symbol "public: static class CppUnit::Test * __cdecl SocketProactorTest::suite(void)" (?suite@SocketProactorTest@@SAPEAVTest@CppUnit@@XZ) referenced in function "public: static class CppUnit::Test * __cdecl SocketsTestSuite::suite(void)" (?suite@SocketsTestSuite@@SAPEAVTest@CppUnit@@XZ)

The offending line is: https://github.com/pocoproject/poco/blob/devel/Net/testsuite/src/SocketsTestSuite.cpp#L35

I noticed that the SocketProactor.h/.cpp files are not in the Net project and that the respective test classes are also not in the TestSuite project, but all the 4 files are in the filesystem.
I couldn't find documentation online about the SocketProactor class. So my question is:

• Is this a deprecated class and the fix is just to remove the offending line, or
• Should the class and its unit test be added to TestSuite_vs90.vcproj and then ProGen'd ?