libpcap should use -fPIC also on FreeBSD (for amd64) I attach a patch to fix it
Created attachment 184631 [details, diff] files/libpcap-1.0.0-freebsd-pic.patch
In CVS in libpcap-1.0.0-r2.ebuild. It seems you didn't send it upstream [URL] yet.
Similar patch is applied in git. So this bug is fixed. Thank you Timothy.