@spikerguy Is the manjaro guy
You can try this
pacman -S base-devel cmake swig json-c python git nodejs
git clone https://github.com/radxa/mraa.git
cd mraa
mkdir build
cd build
cmake -DCMAKE_INSTALL_PREFIX=/usr -DINSTALLTOOLS=on -DBUILDSWIGNODE=off -DCMAKE_INSTALL_LIBDIR=/usr/lib ..
make
See if that builds
sudo make install