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The RDP backend uses functions defined by the Windows Portable Runtime library (WinPR). The library's code is contained within FreeRDP repository, but it is packaged as its own library (seperate pkg-config file). WinPR is added as a dependency to the RDP backend. The version 2.0 is choosen as the version to on since the backend depends on FreeRDP 2.0. Signed-off-by: Guillaume Champagne <champagne.guillaume.c@gmail.com>