IPv6 Failure?

tim@au:~/epic5-2.0.1$ make
make[1]: Entering directory '/home/tim/epic5-2.0.1/source'
gcc -I/usr/local/include/ -g -O -pthread -Wno-pointer-sign -fno-strict-aliasing  -I./../include -I../include -c alias.c
gcc -I/usr/local/include/ -g -O -pthread -Wno-pointer-sign -fno-strict-aliasing  -I./../include -I../include -c alist.c
gcc -I/usr/local/include/ -g -O -pthread -Wno-pointer-sign -fno-strict-aliasing  -I./../include -I../include -c array.c
gcc -I/usr/local/include/ -g -O -pthread -Wno-pointer-sign -fno-strict-aliasing  -I./../include -I../include -c clock.c
gcc -I/usr/local/include/ -g -O -pthread -Wno-pointer-sign -fno-strict-aliasing  -I./../include -I../include -c commands.c
commands.c: In function ‘e_hostname’:
commands.c:1410:4: error: ‘LocalIPv6HostName’ undeclared (first use in this function)
    LocalIPv6HostName ? LocalIPv6HostName : "<default>");
    ^
commands.c:1410:4: note: each undeclared identifier is reported only once for each function it appears in
Makefile:32: recipe for target 'commands.o' failed
make[1]: *** [commands.o] Error 1
make[1]: Leaving directory '/home/tim/epic5-2.0.1/source'
Makefile:105: recipe for target 'all' failed
make: *** [all] Error 2