I tried that too, but my yocto/edison knowledge is too limited. On other Linuxes it is a matter of make and make install. But that didn’t work on yocto. :\
Well, building these libraries from source is not that hard. Most of them are autotools based and all of them provide instructions. I will add libxslt to the image sometime in the future, meanwhile you can use this: libxslt.zip (1.6 MB)
Yes! It works. In the end I discovered I didn’t need the libs. pip install lxml pymavlink did the trick.
I now have Mavproxy booting automatically on the edison. The edison is connected to the rover via the radio modem, injects it’s dgps and broadcasts the mavlink on it’s hotspot. Setting up my base station has never been so convenient!