Master@59366b0 fails to build

* 2016-10-13 59366b0 Pierre Kancir Tools: update ci install script (HEAD -> master, upstream/master, upstream/HEAD)

I’m trying to build master@59366b0 and it’s failing. This is on macOS sierra and it has worked before… (with extra waf flag) see Building ArduPilot on OSX with waf

To Build

#clean
./waf distclean
git submodule deinit -f .
git clean -f -x -d

#rebuild ‘clean’ master
git pull upstream master
git submodule update --init --recursive
./waf configure --board px4-v2
./waf --targets bin/arducopter-quad
Waf: Leaving directory `/Users/bonney/dev_src/ardupilot/build/px4-v2'
Build failed
 -> task in 'mavlink' failed (exit status 1): 
	{task 4325797232: mavgen ardupilotmega.xml -> }
''

see full out here https://gist.github.com/billbonney/81d0e34b354156a76d73a376a4db1d5d

Fixed this by installing the following python libs

pip install lxml future

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