mcaR6-12-2 build error

["Zhou, Jingchen" <jingchen@slac.stanford.edu>]

I am trying to build mcaR6-12-2 on a RHEL5-32 machine, but getting the follow error: 

make[3]: Entering directory `/afs/slac.stanford.edu/g/acctest/vol1/epics/modules/R3-14-12/mca/mcaR6-12-2/mcaApp/CanberraSrc/O.linux-x86'

/usr/bin/gcc -c  -D_POSIX_C_SOURCE=199506L -D_POSIX_THREADS -D_XOPEN_SOURCE=500           -D_X86_  -DUNIX  -D_BSD_SOURCE -Dlinux  -D_REENTRANT   -g   -Wall     -std=gnu99 -DUSE_LIBNET -g `libnet-config --defines`   -m32     -g -fPIC -MMD -I. -I../O.Common -I. -I.. -I../../../include/os/Linux -I../../../include                              -I/afs/slac/g/acctest/epics/modules/R3-14-12/calc/calc-R2-7-lcls3/include  -I/afs/slac/g/acctest/epics/modules/R3-14-12/sscan/sscan-R2-6-3-lcls3/include  -I/afs/slac/g/acctest/epics/modules/R3-14-12/std/std-2-8-lcls1/include  -I/afs/slac/g/acctest/epics/modules/R3-14-12/busy/busy-R1-4-lcls1/include -I/afs/slac/g/acctest/epics/modules/R3-14-12/autosave/autosave-R4-7-lcls5/include/os/Linux -I/afs/slac/g/acctest/epics/modules/R3-14-12/autosave/autosave-R4-7-lcls5/include  -I/afs/slac/g/acctest/epics/modules/R3-14-12/asyn/asyn-R4-17-RC1-lcls1/include -I/afs/slac/g/acctest/epics/base/base-R3-14-12/include/os/Linux -I/afs/slac/g/acctest/epics/bas!
 e/base-R3-14-12/include       ../nmc_comm_subs_1.c
/bin/sh: libnet-config: command not found
In file included from ../nmc_comm_subs_1.c:70:
../nmc_sys_defs.h:52:24: warning: libnet.h: No such file or directory
../nmc_sys_defs.h:53:22: warning: pcap.h: No such file or directory
In file included from ../nmc_comm_subs_1.c:70:
../nmc_sys_defs.h:158: error: expected specifier-qualifier-list before 'libnet_t'
../nmc_sys_defs.h:188: error: expected specifier-qualifier-list before 'pcap_t'
../nmc_sys_defs.h:262: warning: 'struct pcap_pkthdr' declared inside parameter list
../nmc_sys_defs.h:262: warning: its scope is only this definition or declaration, which is probably not what you want
../nmc_comm_subs_1.c: In function 'nmc_initialize':
../nmc_comm_subs_1.c:170: error: 'PCAP_ERRBUF_SIZE' undeclared (first use in this function)
../nmc_comm_subs_1.c:170: error: (Each undeclared identifier is reported only once
../nmc_comm_subs_1.c:170: error: for each function it appears in.)
../nmc_comm_subs_1.c:171: error: storage size of 'bpfprog' isn't known
../nmc_comm_subs_1.c:172: error: 'bpf_u_int32' undeclared (first use in this function)

Do I need libnet-config?

Thanks,
Jingchen