curevtun build issues

Building netsniff-ng toolkit (0.6.3+) for x86_64-alpine-linux-musl:
Building netsniff-ng:
  CC	dissector.c
  CC	dissector_sll.c
  CC	dissector_eth.c
  CC	dissector_80211.c
  CC	dissector_netlink.c
  CC	lookup.c
  CC	proto_arp.c
  CC	proto_ethernet.c
  CC	proto_icmpv4.c
  CC	proto_icmpv6.c
  CC	proto_igmp.c
  CC	proto_ip_authentication_hdr.c
  CC	proto_ip_esp.c
  CC	proto_ipv4.c
  CC	proto_ipv6.c
  CC	proto_ipv6_dest_opts.c
  CC	proto_ipv6_fragm.c
  CC	proto_ipv6_hop_by_hop.c
  CC	proto_ipv6_in_ipv4.c
  CC	proto_ipv6_mobility_hdr.c
  CC	proto_ipv6_no_nxt_hdr.c
  CC	proto_ipv6_routing.c
  CC	proto_lldp.c
  CC	proto_none.c
  CC	proto_tcp.c
  CC	proto_udp.c
  CC	proto_vlan.c
  CC	proto_vlan_q_in_q.c
  CC	proto_mpls_unicast.c
  CC	proto_80211_mac_hdr.c
  CC	privs.c
  CC	proc.c
  CC	dev.c
  CC	str.c
  CC	sig.c
  CC	sock.c
  CC	irq.c
  CC	iosched.c
  CC	ioops.c
  CC	link.c
  CC	xmalloc.c
  CC	hash.c
  CC	bpf.c
  CC	pcap_rw.c
  CC	pcap_sg.c
  CC	pcap_mm.c
  CC	ring_rx.c
  CC	ring_tx.c
  CC	ring.c
  CC	tprintf.c
  CC	timer.c
  CC	die.c
  CC	sysctl.c
  CC	netsniff-ng.c
  CC	bpf_comp.c
  CC	geoip.c
  CC	tstamping.c
  CC	mac80211.c
  CC	proto_nlmsg.c
  LD	netsniff-ng
Building trafgen:
  LEX	trafgen_lexer.l
  YAAC	trafgen_parser.y
  CC	xmalloc.c
  CC	die.c
  CC	ioops.c
  CC	privs.c
  CC	proc.c
  CC	dev.c
  CC	irq.c
  CC	link.c
  CC	str.c
  CC	sig.c
  CC	sock.c
  CC	ring_tx.c
  CC	ring.c
  CC	timer.c
  CC	sysctl.c
  CC	cpp.c
  CC	pcap_sg.c
  CC	pcap_rw.c
  CC	pcap_mm.c
  CC	iosched.c
  CC	trafgen_proto.c
  CC	trafgen_l2.c
  CC	trafgen_l3.c
  CC	trafgen_l4.c
  CC	trafgen/trafgen_lexer.yy.c
  CC	trafgen/trafgen_parser.tab.c
  CC	trafgen.c
  CC	mac80211.c
  LD	trafgen
Building astraceroute:
  CC	xmalloc.c
  CC	proto_none.c
  CC	tprintf.c
  CC	bpf.c
  CC	str.c
  CC	sig.c
  CC	sock.c
  CC	link.c
  CC	dev.c
  CC	ring.c
  CC	die.c
  CC	sysctl.c
  CC	astraceroute.c
  CC	geoip.c
  CC	ioops.c
  LD	astraceroute
Building flowtop:
  CC	xmalloc.c
  CC	str.c
  CC	sig.c
  CC	sock.c
  CC	proc.c
  CC	dev.c
  CC	link.c
  CC	hash.c
  CC	lookup.c
  CC	screen.c
  CC	die.c
  CC	sysctl.c
  CC	ui.c
  CC	flowtop.c
  CC	geoip.c
  CC	ioops.c
  LD	flowtop
Building ifpps:
  CC	xmalloc.c
  CC	ioops.c
  CC	str.c
  CC	link.c
  CC	sock.c
  CC	dev.c
  CC	sig.c
  CC	screen.c
  CC	die.c
  CC	sysctl.c
  CC	ifpps.c
  LD	ifpps
Building bpfc:
  LEX	bpf_lexer.l
  YAAC	bpf_parser.y
  CC	xmalloc.c
  CC	str.c
  CC	bpf.c
  CC	bpfc/bpf_lexer.yy.c
  CC	bpfc/bpf_parser.tab.c
  CC	die.c
  CC	sysctl.c
  CC	proc.c
  CC	cpp.c
  CC	bpfc.c
  LD	bpfc
Building curvetun:
  CC	xmalloc.c
  CC	epoll2.c
  CC	str.c
  CC	dev.c
  CC	stun.c
  CC	sock.c
  CC	sig.c
  CC	link.c
  CC	patricia.c
  CC	corking.c
  CC	trie.c
  CC	taia.c
  CC	hash.c
  CC	rnd.c
  CC	curve.c
In file included from curve.h:9:0,
                 from curve.c:22:
curve.c: In function 'curve25519_proto_init':
crypto.h:15:30: warning: ignoring return value of 'crypto_box_curve25519xsalsa20poly1305_beforenm', declared with attribute warn_unused_result [-Wunused-result]
 #define crypto_box_beforenm  crypto_box_curve25519xsalsa20poly1305_beforenm
                               
crypto.h:15:30: note: in definition of macro 'crypto_box_beforenm'
 #define crypto_box_beforenm  crypto_box_curve25519xsalsa20poly1305_beforenm
                              ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  CC	curve_test.c
curve_test.c: In function 'curve25519_selftest':
curve_test.c:74:2: warning: ignoring return value of 'crypto_box_curve25519xsalsa20poly1305', declared with attribute warn_unused_result [-Wunused-result]
  crypto_box_curve25519xsalsa20poly1305(c, m, 163, nonce, bobpk, alicesk);
  ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  CC	cookie.c
cookie.c:44:8: error: unknown type name 'cookie_io_functions_t'
 static cookie_io_functions_t cookie_log = {
        ^~~~~~~~~~~~~~~~~~~~~
cookie.c:45:2: error: field name not in record or union initializer
  .write  = cookie_writer,
  ^
cookie.c:45:2: note: (near initialization for 'cookie_log')
cookie.c:45:12: warning: initialization makes integer from pointer without a cast [-Wint-conversion]
  .write  = cookie_writer,
            ^~~~~~~~~~~~~
cookie.c:45:12: note: (near initialization for 'cookie_log')
cookie.c:45:12: error: initializer element is not computable at load time
cookie.c:45:12: note: (near initialization for 'cookie_log')
cookie.c: In function 'to_std_log':
cookie.c:50:16: warning: implicit declaration of function 'fopencookie' [-Wimplicit-function-declaration]
  setvbuf(*fp = fopencookie(NULL, "w", cookie_log), NULL, _IOLBF, 0);
                ^~~~~~~~~~~
cookie.c:50:14: warning: assignment makes pointer from integer without a cast [-Wint-conversion]
  setvbuf(*fp = fopencookie(NULL, "w", cookie_log), NULL, _IOLBF, 0);
              ^
make: *** [Makefile:185: curvetun/cookie.o] Error 1
>>> ERROR: netsniff-ng: all failed