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OpenNI – error CS0006: cannot find metadata file `System.Windows.Forms.dll’

During installing the OpenNi kinect drivers, found here: https://github.com/OpenNI/OpenNI, I came across this error:

make[1]: Entering directory `/home/alex/kinect/OpenNI/Platform/Linux-x86/Build/Samples/SimpleViewer.net’
gmcs -out:../../../Bin/Release/SimpleViewer.net.exe -target:winexe -unsafe -o+ -r:OpenNI.net.dll -r:System.Windows.Forms.dll -r:System.Drawing.dll -lib:../../../Bin/Release ../../../../../Samples/SimpleViewer.net/*.cs ../../Res/AssemblyInfo-OpenNI.cs
error CS0006: cannot find metadata file `System.Windows.Forms.dll’
Compilation failed: 1 error(s), 0 warnings
make[1]: *** [../../../Bin/Release/SimpleViewer.net.exe] Error 1
make[1]: Leaving directory `/home/alex/kinect/OpenNI/Platform/Linux-x86/Build/Samples/SimpleViewer.net’
make: *** [Samples/SimpleViewer.net] Error 2

To fix it, simply install the following package:

sudo apt-get install mono-complete

Once finished, re-make and make install and everything should be dandy!