[syslog-ng] Problem compiling syslog-ng with enable-spoof-source on AIX 5.2

Hi, I'm trying to compile syslog-ng.2.1.3 after configuring with --enable-spoof-source. libnet is a prereq as I have learned, but I can't find any hint how to install libnet. Latest version of libnet is "0.10.11: released 18/02/2003" and it seems there is no mailinglist available. The code comes with some makefile templates such as "beos.mak, djgpp.mak, freebsd.mak, linux.mak, mingw.mak, rsxntdj.mak", but none of them works with AIX I have used "GNU Make 3.81" and "gcc version 3.3.2" to compile libnet. All are failing. Do you have any ideas how to get it done? Thank You! Werner