title: Building Qt project with Network using CMake causes undefined references
body: <p>I'm working on a Qt project using the Network package (in particular QTcpSocket). I can easily compile it using qmake, but I fail to do so using cmake (which I need for cross compilation), due to some undefined references regarding the Network package.</p>
  <p>My CmakeLists contains, amongst others, the following lines (with ... being placeholders for other things):</p>
  <pre><code>find_package(Qt5 COMPONENTS Network REQUIRED)
  qt5_use_modules(... Network ...)
  target_link_libraries(... Qt5::Network ...)
  </code></pre>
  <p>I thought those are all that is required, but apparently not so.</p>
  <p>The undefined reference errors I get when linking are a huge lists, so I will only show a small exempt, unless somebody requires more:</p>
  <pre><code>/opt/mxe/usr/x86_64-w64-mingw32.static/qt5/lib/libQt5Network.a(qsslsocket_openssl.o):qsslsocket_openssl.cpp:(.text+0x139c): undefined reference to `__imp_CertCreateCertificateContext'
  /opt/mxe/usr/x86_64-w64-mingw32.static/qt5/lib/libQt5Network.a(qsslsocket_openssl.o):qsslsocket_openssl.cpp:(.text+0x1441): undefined reference to `__imp_CertGetCertificateChain'
  /opt/mxe/usr/x86_64-w64-mingw32.static/qt5/lib/libQt5Network.a(qsslsocket_openssl.o):qsslsocket_openssl.cpp:(.text+0x14c2): undefined reference to `__imp_CertFreeCertificateChain'
  /opt/mxe/usr/x86_64-w64-mingw32.static/qt5/lib/libQt5Network.a(qsslsocket_openssl.o):qsslsocket_openssl.cpp:(.text+0x14cb): undefined reference to `__imp_CertFreeCertificateContext'
  /opt/mxe/usr/x86_64-w64-mingw32.static/qt5/lib/libQt5Network.a(qnetworkinterface_win.o):qnetworkinterface_win.cpp:(.text+0x15): undefined reference to `ConvertInterfaceNameToLuidW'
  /opt/mxe/usr/x86_64-w64-mingw32.static/qt5/lib/libQt5Network.a(qnetworkinterface_win.o):qnetworkinterface_win.cpp:(.text+0x2e): undefined reference to `ConvertInterfaceLuidToIndex'
  /opt/mxe/usr/x86_64-w64-mingw32.static/qt5/lib/libQt5Network.a(qnetworkinterface_win.o):qnetworkinterface_win.cpp:(.text+0x5b): undefined reference to `ConvertInterfaceIndexToLuid'
  /opt/mxe/usr/x86_64-w64-mingw32.static/qt5/lib/libQt5Network.a(qnetworkinterface_win.o):qnetworkinterface_win.cpp:(.text+0x75): undefined reference to `ConvertInterfaceLuidToNameW'
  /opt/mxe/usr/x86_64-w64-mingw32.static/qt5/lib/libQt5Network.a(qnetworkinterface_win.o):qnetworkinterface_win.cpp:(.text+0xec): undefined reference to `GetNetworkParams'
  /opt/mxe/usr/x86_64-w64-mingw32.static/qt5/lib/libQt5Network.a(qnetworkinterface_win.o):qnetworkinterface_win.cpp:(.text+0x1cd): undefined reference to `GetNetworkParams'
  /opt/mxe/usr/x86_64-w64-mingw32.static/qt5/lib/libQt5Network.a(qnetworkinterface_win.o):qnetworkinterface_win.cpp:(.text+0x243): undefined reference to `GetAdaptersAddresses'
  /opt/mxe/usr/x86_64-w64-mingw32.static/qt5/lib/libQt5Network.a(qnetworkinterface_win.o):qnetworkinterface_win.cpp:(.text+0x3c4): undefined reference to `ConvertInterfaceLuidToNameW'
  /opt/mxe/usr/x86_64-w64-mingw32.static/qt5/lib/libQt5Network.a(qnetworkinterface_win.o):qnetworkinterface_win.cpp:(.text+0x91e): undefined reference to `GetAdaptersAddresses'
  </code></pre>
  <p>What did I miss? Are there some other modules I have to add? Is this problem related to me cross compiling using MXE (I didn't tag it as such for now)?</p>
  <p>So far I found <a href="https://stackoverflow.com/questions/44367018/mxe-undefined-reference-to-qt-when-cross-compiling-with-cmake-and-mingw">MXE - Undefined reference to Qt when cross compiling with cmake and mingw</a>, which makes it seem like MXE might be the problem, but that one is not answered.</p>