_                       __   _____                 _                 ____  
    / \   __ _  ___    ___  / _| | ____|_ __ ___  _ __ (_)_ __ ___  ___  |___ \ 
   / _ \ / _` |/ _ \  / _ \| |_  |  _| | '_ ` _ \| '_ \| | '__/ _ \/ __|   __) |
  / ___ \ (_| |  __/ | (_) |  _| | |___| | | | | | |_) | | | |  __/\__ \  / __/ 
 /_/   \_\__, |\___|  \___/|_|   |_____|_| |_| |_| .__/|_|_|  \___||___/ |_____|
         |___/                                   |_|                            


OK got openage to build and run on the latest Manjaro (5.7.0-1-MANJARO-ARM) Pinebookpro !
Here are the steps taken (please excuse if I have missed any package from pacman install list - let me know if it works for you)

installed packages on Manjaro via pacman -S *packagename*

cmake
cython
python-numpy
python-pillow
python-pygments
eigen
doxygen
graphviz
qtcreator

//Create a working directory to hold the sources
// and work from there

// First we need to build Nyan

// clone Nyan
git clone https://github.com/SFTtech/nyan
cd nyan
mkdir build
cmake ..
make -j3
su
# make install
exit

// clone openage
git clone https://github.com/SFTtech/openage
cd openage
mkdir build
cmake ..
make -j3
su
# make install

// Install Age of Empires 2 (HD version works ) via Wine on x86_64 linux
// copy over the whole aoe2 directory to the Pinebook
// I install it usually as c:\aoe2 and then I just tar the .wine/drive_c/aoe2
// and scp to the pinebook

// Launch openage from the openage/build directory
./run

// Point the setup to the aoe2 datadir