Using WRL for C++/CX functions - linker error

Question

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What is an undefined reference/unresolved external symbol error and how do I fix it?

I'm trying to make WinRT library that is not using CX extension. I need to get name of package, roaming data folder, etc.. I wrote some wrapper, but when I'm linking this library to executable project, I get linker error

error LNK2019: unresolved external symbol _WindowsCreateStringReference@16 referenced in function "private: void __thiscall Microsoft::WRL::Wrappers::HStringReference::CreateReference(wchar_t const *,unsigned int,unsigned int)" (?CreateReference@HStringReference@Wrappers@WRL@Microsoft@@AAEXPB_WII@Z)
error LNK2019: unresolved external symbol _WindowsDeleteString@4 referenced in function "public: __thiscall Microsoft::WRL::Wrappers::HStringReference::~HStringReference(void)" (??1HStringReference@Wrappers@WRL@Microsoft@@QAE@XZ)
error LNK2019: unresolved external symbol _WindowsGetStringRawBuffer@8 referenced in function "long __cdecl aponialib::winrt::GetFullName(class std::basic_string<wchar_t,struct std::char_traits<wchar_t>,class std::allocator<wchar_t> > &)" (?GetFullName@winrt@aponialib@@YAJAAV?$basic_string@_WU?$char_traits@_W@std@@V?$allocator@_W@2@@std@@@Z)
error LNK2019: unresolved external symbol __imp__RoGetActivationFactory@12 referenced in function "long __cdecl Windows::Foundation::GetActivationFactory<struct ABI::Windows::Storage::IApplicationDataStatics>(struct HSTRING__ *,struct ABI::Windows::Storage::IApplicationDataStatics * *)" (??$GetActivationFactory@UIApplicationDataStatics@Storage@Windows@ABI@@@Foundation@Windows@@YAJPAUHSTRING__@@PAPAUIApplicationDataStatics@Storage@1ABI@@@Z)

this is package name wrapper

// including in .h
#include <windows.h>
#include <string>
#include <Strsafe.h>
#include <Winstring.h>

#include <windows.storage.h>
#include <Windows.ApplicationModel.h>
#include <windows.Foundation.h>
#include <wrl/client.h>
#include <wrl/wrappers/corewrappers.h>

//...

HRESULT GetFullName(std::wstring &fullName)
{
    HRESULT hr;
    Microsoft::WRL::ComPtr<ABI::Windows::ApplicationModel::IPackageStatics> packageStatics;

    hr = Windows::Foundation::GetActivationFactory(Microsoft::WRL::Wrappers::HStringReference(RuntimeClass_Windows_ApplicationModel_Package).Get(), &packageStatics);
    if (FAILED(hr))
        return hr;

    Microsoft::WRL::ComPtr<ABI::Windows::ApplicationModel::IPackage> package;
    hr = packageStatics->get_Current(&package);
    if (FAILED(hr))
        return hr;

    Microsoft::WRL::ComPtr<ABI::Windows::ApplicationModel::IPackageId> packageId;
    hr = package->get_Id(&packageId);
    if (FAILED(hr))
        return hr;

    HSTRING name;
    hr = packageId->get_FullName(&name);
    if (FAILED(hr))
        return hr;

    UINT32 length;
    PCWSTR value = WindowsGetStringRawBuffer(name, &length);
    fullName = value;
    WindowsDeleteString(name);
    return S_OK;
}

Maybe I don't get WRL and I'm using it wrong.

Thank you for your help :) Tomas