it to build.
[memory below the 4GB line is very limited on at least some modern
intel x86 processors as used in the package build cluster; according to
Dell systems with Skylake CPUs "allocate more memory" (to the hardware)
"as they are often configured with Thunderbolt capability" ...
"regardless of the system having actual Thunderbolt hardware" and
according to Acer they "reserve more memory for PCI-Express and MMIO
devices" - presumably same for Kaby Lake as in the build machines].