| 
	 You're cross compiling, so you need to have the cross libraries installed.  Did you also  
sudo dpkg --add-architecture armhf 
sudo apt update 
sudo apt install libmnl-dev:armhf 
I can't reproduce here at all: 
┌──(steev㉿panda)-[/storage/cross/libnftnl] 
└─$ ionice -c 3 nice -n19 make -j$((nproc-2)) 
make  all-recursive 
make[1]: Entering directory '/storage/cross/libnftnl' 
Making all in src 
make[2]: Entering directory '/storage/cross/libnftnl/src' 
CC       utils.lo 
CC       batch.lo 
CC       flowtable.lo 
CC       common.lo 
CC       gen.lo 
CC       table.lo 
CC       trace.lo 
CC       chain.lo 
CC       object.lo 
CC       rule.lo 
CC       set.lo 
CC       set_elem.lo 
CC       ruleset.lo 
CC       udata.lo 
CC       expr.lo 
CC       expr_ops.lo 
CC       expr/bitwise.lo 
CC       expr/byteorder.lo 
CC       expr/cmp.lo 
CC       expr/range.lo 
CC       expr/connlimit.lo 
CC       expr/counter.lo 
CC       expr/ct.lo 
CC       expr/data_reg.lo 
CC       expr/dup.lo 
CC       expr/exthdr.lo 
CC       expr/flow_offload.lo 
CC       expr/fib.lo 
CC       expr/fwd.lo 
CC       expr/limit.lo 
CC       expr/log.lo 
CC       expr/lookup.lo 
CC       expr/dynset.lo 
CC       expr/immediate.lo 
CC       expr/match.lo 
CC       expr/meta.lo 
CC       expr/numgen.lo 
CC       expr/nat.lo 
CC       expr/tproxy.lo 
CC       expr/objref.lo 
CC       expr/payload.lo 
CC       expr/queue.lo 
CC       expr/quota.lo 
CC       expr/reject.lo 
CC       expr/rt.lo 
CC       expr/target.lo 
CC       expr/tunnel.lo 
CC       expr/masq.lo 
CC       expr/redir.lo 
CC       expr/hash.lo 
CC       expr/socket.lo 
CC       expr/synproxy.lo 
CC       expr/osf.lo 
CC       expr/xfrm.lo 
CC       obj/counter.lo 
CC       obj/ct_helper.lo 
CC       obj/quota.lo 
CC       obj/tunnel.lo 
CC       obj/limit.lo 
CC       obj/synproxy.lo 
CC       obj/ct_timeout.lo 
CC       obj/secmark.lo 
CC       obj/ct_expect.lo 
CCLD     libnftnl.la 
make[2]: Leaving directory '/storage/cross/libnftnl/src' 
Making all in include 
make[2]: Entering directory '/storage/cross/libnftnl/include' 
Making all in libnftnl 
make[3]: Entering directory '/storage/cross/libnftnl/include/libnftnl' 
make[3]: Nothing to be done for 'all'. 
make[3]: Leaving directory '/storage/cross/libnftnl/include/libnftnl' 
Making all in linux 
make[3]: Entering directory '/storage/cross/libnftnl/include/linux' 
Making all in netfilter 
make[4]: Entering directory '/storage/cross/libnftnl/include/linux/netfilter' 
make[4]: Nothing to be done for 'all'. 
make[4]: Leaving directory '/storage/cross/libnftnl/include/linux/netfilter' 
make[4]: Entering directory '/storage/cross/libnftnl/include/linux' 
make[4]: Nothing to be done for 'all-am'. 
make[4]: Leaving directory '/storage/cross/libnftnl/include/linux' 
make[3]: Leaving directory '/storage/cross/libnftnl/include/linux' 
make[3]: Entering directory '/storage/cross/libnftnl/include' 
make[3]: Nothing to be done for 'all-am'. 
make[3]: Leaving directory '/storage/cross/libnftnl/include' 
make[2]: Leaving directory '/storage/cross/libnftnl/include' 
Making all in examples 
make[2]: Entering directory '/storage/cross/libnftnl/examples' 
make[2]: Nothing to be done for 'all'. 
make[2]: Leaving directory '/storage/cross/libnftnl/examples' 
Making all in tests 
make[2]: Entering directory '/storage/cross/libnftnl/tests' 
make[2]: Nothing to be done for 'all'. 
make[2]: Leaving directory '/storage/cross/libnftnl/tests' 
make[2]: Entering directory '/storage/cross/libnftnl' 
make[2]: Leaving directory '/storage/cross/libnftnl' 
make[1]: Leaving directory '/storage/cross/libnftnl' 	 |