Nothing builds with Ubuntu 18.04 about tomu-quickstart HOT 4 OPEN

xobs@Pazuzu:~/Code/Tomu/quickstart/usb-hid$ gdb-multiarch usb-hid.elf
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Reading symbols from usb-hid.elf...done.
(gdb) disassemble memcpy,+4
Dump of assembler code from 0x5950 to 0x5954:
   0x00005950 <memcpy+0>:       movs    r7, r1
   0x00005952 <memcpy+2>:       b.n     0x5ffa
End of assembler dump.
(gdb) x 0x5ffa
0x5ffa: Cannot access memory at address 0x5ffa
(gdb)