[syslog-ng] compilation errors with --enable-spoof-source

Hi, I am using syslog-ng 1.6.11 and trying to compile this package with ./configure --enable-spoof-source, it throws errors as below checking whether to enable Sun STREAMS support... yes checking whether to enable Sun door support... yes checking whether to enable TCP wrapper support... no checking whether to enable spoof_source support... ./configure: test: too many arguments configure: error: libnet-config not found It compiles fine without --enable-spoof-source this option. Could you do the needful. Thanks, Ravi Kumar P.