```
$ bmake
=> Bootstrap dependency digest>=20010302: found digest-20190127
===> Building for bitcoin-0.20.1nb3
Making all in src
gmake[1]: Entering directory '/home/pbulk/build/finance/bitcoin/work/bitcoin-0.20.1/src'
gmake[2]: Entering directory '/home/pbulk/build/finance/bitcoin/work/bitcoin-0.20.1/src'
gmake[3]: Entering directory '/home/pbulk/build/finance/bitcoin/work/bitcoin-0.20.1'
gmake[3]: Leaving directory '/home/pbulk/build/finance/bitcoin/work/bitcoin-0.20.1'
  CXXLD    bitcoin-tx
Undefined                       first referenced
 symbol                             in file
freeifaddrs                         libbitcoin_util.a(libbitcoin_util_a-randomenv.o)
getifaddrs                          libbitcoin_util.a(libbitcoin_util_a-randomenv.o)
ld: fatal: symbol referencing errors. No output written to .libs/bitcoin-tx
collect2: error: ld returned 1 exit status
gmake[2]: *** [Makefile:7355: bitcoin-tx] Error 1
gmake[2]: Leaving directory '/home/pbulk/build/finance/bitcoin/work/bitcoin-0.20.1/src'
gmake[1]: *** [Makefile:17263: all-recursive] Error 1
gmake[1]: Leaving directory '/home/pbulk/build/finance/bitcoin/work/bitcoin-0.20.1/src'
gmake: *** [Makefile:782: all-recursive] Error 1
*** Error code 2

Stop.
bmake[1]: stopped in /data/pkgsrc/finance/bitcoin
*** Error code 1
```

I found [this](https://github.com/pydron/ifaddr/issues/23), which seems to be the same issue, but on a Python context.

Previous issues with compiling on Illumos seem to have been sorted out (#15708 & more), but now it's stuck here.
#    if defined(KERN_PROC) && defined(KERN_PROC_ALL)
    AddSysctl<CTL_KERN, KERN_PROC, KERN_PROC_ALL>(hasher);
#    endif
#  endif
#  ifdef CTL_HW
#    ifdef HW_DISKSTATS
    AddSysctl<CTL_HW, HW_DISKSTATS>(hasher);
#    endif
#  endif
#  ifdef CTL_VM
#    ifdef VM_LOADAVG
    AddSysctl<CTL_VM, VM_LOADAVG>(hasher);
#    endif
#    ifdef VM_TOTAL
    AddSysctl<CTL_VM, VM_TOTAL>(hasher);
#    endif
#    ifdef VM_METER
    AddSysctl<CTL_VM, VM_METER>(hasher);
#    endif
#  endif
#endif
    
    void* addr = malloc(4097);
    hasher << &addr << addr;
    free(addr);
}
void RandAddStaticEnv(CSHA512& hasher)
{
    
    hasher << (CHAR_MIN < 0) << sizeof(void*) << sizeof(long) << sizeof(int);