tcpdump warning messages

tcpdump.o: In function `droproot':
tcpdump.c:(.text+0x457): warning: Using 'initgroups' in statically linked applications requires at runtime the shared libraries from the glibc version used for linking
tcpdump.c:(.text+0x3d1): warning: Using 'getpwnam' in statically linked applications requires at runtime the shared libraries from the glibc version used for linking
./../libpcap-1.5.3/libpcap.a(nametoaddr.o): In function `pcap_nametoaddrinfo':
nametoaddr.c:(.text+0xd3): warning: Using 'getaddrinfo' in statically linked applications requires at runtime the shared libraries from the glibc version used for linking
addrtoname.o: In function `getname':
addrtoname.c:(.text+0x1ad): warning: Using 'gethostbyaddr' in statically linked applications requires at runtime the shared libraries from the glibc version used for linking
./../libpcap-1.5.3/libpcap.a(nametoaddr.o): In function `pcap_nametoaddr':
nametoaddr.c:(.text+0x1a): warning: Using 'gethostbyname' in statically linked applications requires at runtime the shared libraries from the glibc version used for linking
./../libpcap-1.5.3/libpcap.a(nametoaddr.o): In function `pcap_nametonetaddr':
nametoaddr.c:(.text+0x10a): warning: Using 'getnetbyname' in statically linked applications requires at runtime the shared libraries from the glibc version used for linking
print-cnfp.o: In function `cnfp_print':
print-cnfp.c:(.text+0x3ba): warning: Using 'getprotobynumber' in statically linked applications requires at runtime the shared libraries from the glibc version used for linking
print-isakmp.o: In function `ikev1_id_print':
print-isakmp.c:(.text+0x1859): warning: Using 'setprotoent' in statically linked applications requires at runtime the shared libraries from the glibc version used for linking
print-isakmp.c:(.text+0x1898): warning: Using 'endprotoent' in statically linked applications requires at runtime the shared libraries from the glibc version used for linking
./../libpcap-1.5.3/libpcap.a(nametoaddr.o): In function `pcap_nametoproto':
nametoaddr.c:(.text+0x36f): warning: Using 'getprotobyname' in statically linked applications requires at runtime the shared libraries from the glibc version used for linking
./../libpcap-1.5.3/libpcap.a(nametoaddr.o): In function `pcap_nametoport':
nametoaddr.c:(.text+0x15b): warning: Using 'getservbyname' in statically linked applications requires at runtime the shared libraries from the glibc version used for linking
addrtoname.o: In function `init_servarray':
addrtoname.c:(.text+0x1313): warning: Using 'getservent' in statically linked applications requires at runtime the shared libraries from the glibc version used for linking
addrtoname.c:(.text+0x1325): warning: Using 'endservent' in statically linked applications requires at runtime the shared libraries from the glibc version used for linking
print-sunrpc.o: In function `progstr':
print-sunrpc.c:(.text+0x2e7): warning: Using 'getrpcbynumber' in statically linked applications requires at runtime the shared libraries from the glibc version used for linking