How place an LD_PRELOAD bash command into a .desktop file (LXDE)

To enable video in Skype with my webcam I must launch skype the following way:
LD_PRELOAD=/usr/lib/libv4l/v4l1compat.so skype
To get that command done from my LXDE menu I tried to edit the skype.desktop file and place that line after the "Exec" desktop spec. It does not work, in quotes or not, nor with a full pathname to skype.
How can I force my desktop entry to run the command above?

bash -c "LD_PRELOAD=... skype" should work too, for example.

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