Everything compiled as C++ with these CFLAGS:

c++ -O2 -g -Wall -mtune=pentium -DWIN32 -D_WIN32 -DHAVE_SYS_STAT_H=1
-DHAVE_UNISTD_H=1 -DHAVE_SYS_TYPES_H=1 -DHAVE_SYS_PARAM_H=1 -DHAVE___ATTRIBUTE__=1
-DHAVE_MEMCPY=1 -DHAVE_AF_INET6 -DHAVE_GETNAMEINFO=1 -DHAVE_GETADDRINFO=1
-DHAVE_SOCKADDR_STORAGE=1 -DHAVE_GAI_STRERROR=1 -DHAVE_SIGNAL -DHAVE_SNPRINTF
-DHAVE_VSNPRINTF -DSNMP_FUNC_TYPE=WINAPI -mms-bitfields -DG_DISABLE_CAST_CHECKS
-DPCRE_STATIC -fconserve-space -fno-rtti -I. -I./nbase -I./nsock/include -I./mswin32
-I../../libpcre -I../libpcap -I../libpcap/Win32/Include

-------------------------

mswin32/winip/pcapsend.c: In function `int realsend(_ADAPTER*, const char*, int, BYTE*, BYTE*, int, DWORD, DWORD)':
mswin32/winip/pcapsend.c:192: warning: int format, DWORD arg (arg 2)
mswin32/winip/pcapsend.c:192: warning: int format, DWORD arg (arg 3)
mswin32/winip/pcapsend.c:213: warning: int format, DWORD arg (arg 2)
mswin32/winip/pcapsend.c: In function `unsigned int SendThreadProc(void*)':
mswin32/winip/pcapsend.c:354: warning: comparison between signed and unsigned integer expressions
mswin32/winip/pcapsend.c:364: warning: comparison between signed and unsigned integer expressions
mswin32/winip/pcapsend.c:388: warning: comparison between signed and unsigned integer expressions
mswin32/winip/pcapsend.c:294: warning: unused variable 'nRes'
mswin32/winip/pcapsend.c: In function `void AddPacketToQueue(const void*, int, DWORD, int)':
mswin32/winip/pcapsend.c:483: warning: long unsigned int format, int arg (arg 3)
mswin32/winip/pcapsend.c: In function `int ip2route(const in_addr*, DWORD*, DWORD*)':
mswin32/winip/pcapsend.c:597: warning: int format, DWORD arg (arg 2)
mswin32/winip/pcapsend.c: In function `_ADAPTER* if2adapter(int, BYTE*, int*, DWORD*)':
mswin32/winip/pcapsend.c:649: warning: unused variable 'name'
mswin32/winip/pcapsend.c: In function `int pcapsendraw(const char*, int, sockaddr*, int)':
mswin32/winip/pcapsend.c:742: warning: comparison between signed and unsigned integer expressions
mswin32/winip/pcapsend.c:720: warning: unused variable 'cb'
mswin32/winip/pcapsend.c: In function `void pcapsend_init()':
mswin32/winip/pcapsend.c:809: warning: long unsigned int format, int arg (arg 2)
mswin32/winip/pcapsend.c:826: warning: long unsigned int format, int arg (arg 2)
mswin32/winip/pcapsend.c: In function `int get_best_route(DWORD, MIB_IPFORWARDROW*)':
mswin32/winip/pcapsend.c:937: warning: comparison between signed and unsigned integer expressions
mswin32/winip/pcapsend.c:962: warning: comparison between signed and unsigned integer expressions
mswin32/winip/pcapsend.c:968: warning: comparison between signed and unsigned integer expressions
mswin32/winip/pcapsend.c:973: warning: comparison between signed and unsigned integer expressions
mswin32/winip/pcapsend.c:975: warning: comparison between signed and unsigned integer expressions
mswin32/winip/pcapsend.c:975: warning: comparison between signed and unsigned integer expressions
mswin32/winip/pcapsend.c: In function `int lookupip(DWORD, DWORD)':
mswin32/winip/pcapsend.c:1011: warning: unused variable 'time'
mswin32/winip/pcapsend.c: In function `int SearchARP(DWORD, int, BYTE*, int*)':
mswin32/winip/pcapsend.c:1127: warning: comparison between signed and unsigned integer expressions
mswin32/winip/pcapsend.c: In function `int get_best_route(DWORD, MIB_IPFORWARDROW*)':
mswin32/winip/pcapsend.c:949: warning: 'bestmask' might be used uninitialized in this function
mswin32/winip/pcapsend.c:949: warning: 'bestmetric' might be used uninitialized in this function
mswin32/winip/pcapsend.c: At global scope:
mswin32/winip/pcapsend.c:855: warning: 'num_names' defined but not used
mswin32/winip/rawrecv.c: In function `pcap_t* rawrecv_open(const char*)':
mswin32/winip/rawrecv.c:77: warning: long unsigned int format, int arg (arg 2)
mswin32/winip/rawrecv.c: In function `char* rawrecv_readip(pcap_t*, unsigned int*, long int, timeval*)':
mswin32/winip/rawrecv.c:131: warning: comparison between signed and unsigned integer expressions
mswin32/winip/rawrecv.c:160:2: warning: no newline at end of file
mswin32/winip/winip.c: In function `void winip_postopt_init()':
mswin32/winip/winip.c:255: warning: comparison between signed and unsigned integer expressions
mswin32/winip/winip.c:257: warning: comparison between signed and unsigned integer expressions
mswin32/winip/winip.c:361: warning: `and' of mutually exclusive equal-tests is always 0
mswin32/winip/winip.c: In function `void winip_init_pcap(char*)':
mswin32/winip/winip.c:433: warning: unused variable 'phys'
mswin32/winip/winip.c: In function `void winip_list_interfaces()':
mswin32/winip/winip.c:627: warning: wchar_t format, different type arg (arg 2)
nsock/src/netutils.c:79: warning: 'netutils_debugging' defined but not used
nsock/src/nsock_core.c: In function `void handle_connect_result(mspool*, msevent*, nse_status)':
nsock/src/nsock_core.c:278: warning: comparison between signed and unsigned integer expressions
nsock/src/nsock_core.c:279: warning: comparison between signed and unsigned integer expressions
nsock/src/nsock_core.c:280: warning: comparison between signed and unsigned integer expressions
nsock/src/nsock_core.c:281: warning: comparison between signed and unsigned integer expressions
nsock/src/nsock_core.c:282: warning: comparison between signed and unsigned integer expressions
nsock/src/nsock_core.c:283: warning: comparison between signed and unsigned integer expressions
nsock/src/nsock_core.c: In function `void handle_write_result(mspool*, msevent*, nse_status)':
nsock/src/nsock_core.c:384: warning: comparison between signed and unsigned integer expressions
nsock/src/nsock_core.c:385: warning: comparison between signed and unsigned integer expressions
nsock/src/nsock_core.c:387: warning: comparison between signed and unsigned integer expressions
nsock/src/nsock_core.c:388: warning: comparison between signed and unsigned integer expressions
nsock/src/nsock_core.c:389: warning: comparison between signed and unsigned integer expressions
nsock/src/nsock_core.c:390: warning: comparison between signed and unsigned integer expressions
nsock/src/nsock_core.c: In function `int do_actual_read(mspool*, msevent*)':
nsock/src/nsock_core.c:447: warning: comparison between signed and unsigned integer expressions
nsock/src/nsock_core.c: In function `void handle_read_result(mspool*, msevent*, nse_status)':
nsock/src/nsock_core.c:583: warning: comparison between signed and unsigned integer expressions
nsock/src/nsock_core.c:584: warning: comparison between signed and unsigned integer expressions
nsock/src/nsock_core.c:586: warning: comparison between signed and unsigned integer expressions
nsock/src/nsock_core.c:587: warning: comparison between signed and unsigned integer expressions
nsock/src/nsock_core.c:588: warning: comparison between signed and unsigned integer expressions
nsock/src/nsock_core.c:589: warning: comparison between signed and unsigned integer expressions
nsock/src/nsock_core.c: In function `void nsp_add_event(mspool*, msevent*)':
nsock/src/nsock_core.c:851: warning: comparison between signed and unsigned integer expressions
nsock/src/nsock_core.c:852: warning: comparison between signed and unsigned integer expressions
nsock/src/nsock_core.c:853: warning: comparison between signed and unsigned integer expressions
nsock/src/nsock_core.c:861: warning: comparison between signed and unsigned integer expressions
nsock/src/nsock_core.c:872: warning: comparison between signed and unsigned integer expressions
nsock/src/nsock_core.c: In function `nsock_loopstatus nsock_loop(void*, int)':
nsock/src/nsock_core.c:89: warning: 'sock_err' might be used uninitialized in this function
nsock/src/nsock_write.c: In function `nsock_event_id nsock_printf(void*, void*, void (*)(void*, void*, void*), int, void*, char*, ...)':
nsock/src/nsock_write.c:121: warning: comparison between signed and unsigned integer expressions
nmap.cc: In function `int nmap_fetchfile(char*, int, char*)':
nmap.cc:1875: warning: unused variable 'pw'
nmap_rpc.cc: In function `void get_rpc_results(Target*, portinfo*, scanstats*, portinfolist*, rpcscaninfo*)':
nmap_rpc.cc:483: warning: comparison between signed and unsigned integer expressions
nmap_rpc.cc:487: warning: comparison between signed and unsigned integer expressions
nmap_rpc.cc:528: warning: int format, long unsigned int arg (arg 2)
nmap_rpc.cc:528: warning: int format, long unsigned int arg (arg 3)
nmap_rpc.cc:528: warning: int format, long unsigned int arg (arg 4)
nmap_rpc.cc:528: warning: int format, long unsigned int arg (arg 5)
nmap_rpc.cc:528: warning: int format, long unsigned int arg (arg 7)
nmap_rpc.cc:528: warning: int format, long unsigned int arg (arg 8)
nmap_rpc.cc:528: warning: int format, long unsigned int arg (arg 9)
nmap_rpc.cc:528: warning: int format, long unsigned int arg (arg 10)
nmap_rpc.cc: In function `int send_rpc_query(const in_addr*, short unsigned int, int, long unsigned int, int, int)':
nmap_rpc.cc:286: warning: 'err' might be used uninitialized in this function
scan_engine.cc: In member function `bool ConnectScanInfo::watchSD(int)':
scan_engine.cc:521: warning: comparison between signed and unsigned integer expressions
scan_engine.cc:522: warning: comparison between signed and unsigned integer expressions
scan_engine.cc:523: warning: comparison between signed and unsigned integer expressions
scan_engine.cc: In member function `bool ConnectScanInfo::clearSD(int)':
scan_engine.cc:537: warning: comparison between signed and unsigned integer expressions
scan_engine.cc:538: warning: comparison between signed and unsigned integer expressions
scan_engine.cc:539: warning: comparison between signed and unsigned integer expressions
services.cc: In function `int nmap_services_init()':
services.cc:122: warning: int format, DWORD arg (arg 3)
Target.cc: In member function `void Target::GenerateIPString()':
Target.cc:148: warning: unused variable 'sin6'
TargetGroup.cc: In member function `int TargetGroup::get_next_host(sockaddr_storage*, size_t*)':
TargetGroup.cc:283: warning: unused variable 'sin6'
targets.cc: In function `int hostupdate(Target**, Target*, int, int, int, timeout_info*, timeval*, timeval*, pingtune*, tcpqueryinfo*, pingstyle)':
targets.cc:165: warning: comparison between signed and unsigned integer expressions
targets.cc:166: warning: comparison between signed and unsigned integer expressions
targets.cc:167: warning: comparison between signed and unsigned integer expressions
targets.cc: In function `int sendconnecttcpquery(Target**, tcpqueryinfo*, Target*, int, u16, timeval*, pingtune*, timeout_info*, int)':
targets.cc:702: warning: comparison between signed and unsigned integer expressions
targets.cc:703: warning: comparison between signed and unsigned integer expressions
targets.cc:704: warning: comparison between signed and unsigned integer expressions
targets.cc:640: warning: unused variable 'sin6'
targets.cc: In function `int get_ping_results(int, pcap_t*, Target**, int, timeval*, pingtune*, timeout_info*, int, pingtech*, scan_lists*)':
targets.cc:1082: warning: comparison between signed and unsigned integer expressions
targets.cc:1083: warning: comparison between signed and unsigned integer expressions
In file included from tcpip.cc:120:
./mswin32/pcap-int.h:147:7: warning: no newline at end of file
tcpip.cc: In function `pcap_t* my_real_pcap_open_live(char*, int, int, int)':
tcpip.cc:473: warning: too few arguments for format
tcpip.cc: In function `u8* build_udp_raw(in_addr*, const in_addr*, int, u16, u16, u16, char*, u16, u32*)':
tcpip.cc:944: warning: statement has no effect
tcpip.cc: In function `void max_rcvbuf(int)':
tcpip.cc:2092: warning: unused variable 'optval'
tcpip.cc:2093: warning: unused variable 'optlen'
tcpip.cc: In function `int recvtime(int, char*, int, int, int*)':
tcpip.cc:2184: warning: comparison between signed and unsigned integer expressions
In file included from mswin32/winip/MibAccess.cpp:26:
mswin32/winip/MibAccess.h: In member function `void MIBTraverser::Init(AsnObjectIdentifier*, UINT)':
mswin32/winip/MibAccess.h:157: warning: comparison between signed and unsigned integer expressions
mswin32/winip/MibAccess.h: In member function `void MIBTraverser::clean()':
mswin32/winip/MibAccess.h:164: warning: comparison between signed and unsigned integer expressions
In file included from mswin32/winip/MibAccess.cpp:26:
mswin32/winip/MibAccess.h:206:7: warning: no newline at end of file
In file included from mswin32/winip/snmp95.cpp:35:
mswin32/winip/MibAccess.h: In member function `void MIBTraverser::Init(AsnObjectIdentifier*, UINT)':
mswin32/winip/MibAccess.h:157: warning: comparison between signed and unsigned integer expressions
mswin32/winip/MibAccess.h: In member function `void MIBTraverser::clean()':
mswin32/winip/MibAccess.h:164: warning: comparison between signed and unsigned integer expressions
In file included from mswin32/winip/snmp95.cpp:35:
mswin32/winip/MibAccess.h:206:7: warning: no newline at end of file
mswin32/winip/snmp95.cpp: In function `DWORD GetIfTableSafe(MIB_IFTABLE*, DWORD*, BOOL)':
mswin32/winip/snmp95.cpp:250: warning: converting of negative value `-0x000000001' to `DWORD'
mswin32/winip/snmp95.cpp: In function `DWORD GetIpNetTableSafe(MIB_IPNETTABLE*, DWORD*, BOOL)':
mswin32/winip/snmp95.cpp:358: warning: converting of negative value `-0x000000001' to `DWORD'
mswin32/winip/snmp95.cpp:375: warning: comparison between signed and unsigned integer expressions
mswin32/winip/snmp95.cpp:389: warning: comparison between signed and unsigned integer expressions
mswin32/winip/snmp95.cpp: In function `DWORD GetIpForwardTableSafe(MIB_IPFORWARDTABLE*, DWORD*, BOOL)':
mswin32/winip/snmp95.cpp:416: warning: converting of negative value `-0x000000001' to `DWORD'
mswin32/winip/snmp95.cpp: At global scope:
mswin32/winip/snmp95.cpp:138: warning: 'int compip(const void*, const void*)' defined but not used