...
gcc -g -O2 -D_REENTRANT -DFREEBSD -D_THREAD_SAFE -DFD_SETSIZE=2048 -I. -pthread -I/usr/local/include/db4 -export-dynamic -DHAVE_CONFIG_H -I/usr/local/include/db4 -shared -c transparent.c
transparent.c: In function `redir':
transparent.c:217: error: `IPL_NAT' undeclared (first use in this function)
transparent.c:217: error: (Each undeclared identifier is reported only once
transparent.c:217: error: for each function it appears in.)
*** Error code 1

Stop in /oops/oops-1.5.23/src/modules.
*** Error code 1

Stop in /oops/oops-1.5.23/src.
*** Error code 1

Stop in /oops/oops-1.5.23.