During the builds, using somewhat underpowered hardware (1 GHz CPU, 8GB RAM, no SSD), the build process uses 100% CPU and a large RAM amount, different AOSP versions tried (7.1, 8.0, 9, 10) , and my CPU stays at 1.00 GHz rather than auto overclocking (it can, up to 1.40 GHz). Long running builds frequently crashes as well but simply running make again allows the build to proceed. Not sure if my hardware meets the requeriments for AOSP builds.