libpcap failure - Leopard 10.5.1

[Stefmit]

--->  Building libpcap with target all
Error: Target org.macports.build returned: shell command " 
cd "/opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_release_ports_net_libpcap/work/libpcap-0.9.8" 
&& make all " returned error 2
Command output: rm -f libpcap.dylib
/usr/bin/gcc-4.0 -dynamiclib -o libpcap.`cat VERSION`.dylib \
                -install_name /opt/local/lib/libpcap.0.dylib \
                -compatibility_version 1.0.0 -current_version `cat VERSION` \
                pcap-bpf.o fad-getad.o pcap.o inet.o gencode.o optimize.o 
nametoaddr.o etherent.o savefile.o bpf_filter.o bpf_image.o bpf_dump.o  
scanner.o grammar.o version.o  
Undefined symbols:
  "_lex_init", referenced from:
      _pcap_compile in gencode.o
  "_lex_cleanup", referenced from:
      _pcap_compile in gencode.o
      _pcap_compile in gencode.o
  "_pcap_lex", referenced from:
      _pcap_parse in grammar.o
ld: symbol(s) not found
collect2: ld returned 1 exit status
make: *** [libpcap.dylib] Error 1

Error: Unable to upgrade port: 1