How to compile on Ubuntu?

[noeldum]

make build ARCH=x86-64

I tried the above but it returns
undefined reference to `PopCnt16'

[GiacobboNicola]

Hi!
I'm facing the same error.
My solution was to modify the util.h file:
#ifndef USE_POPCNT
extern uint8_t PopCnt16[1 << 16];
union {
uint64_t bb;
uint16_t u[4];
} v = { b };
return PopCnt16[v.u[0]] + PopCnt16[v.u[1]] + PopCnt16[v.u[2]] + PopCnt16[v.u[3]];
#elif defined(_MSC_VER) || defined(__INTEL_COMPILER)

After that I was able to compile running make build ARCH=x86-64