mraa version v0.5.4-27-g643bb99 apparently has an issue they are working it out.
If you can wget http:/iotdk.intel.com/repos/1.1/intelgalactic/libmraa0_0.5.2.4_i586.ipk from the console.
opkg install libmraa0_0.5.2.4_i586.ipk
Single slash at wget needs to be a double slash