[tproxy] iptables make error with cttproxy

I am attempting to build iptables 1.3.5 (as bundled with centos 5.1 x86_64) with cttproxy 2.6.18-2.0.6. When compiling iptables, I get an error during libipt_TPROXY_sh.o: cc -shared -o extensions/libipt_TPROXY.so extensions/libipt_TPROXY_sh.o extensions/libipt_TPROXY_sh.o: In function '_init': libipt_TPROXY.c: (.text+0x10): multiple definition of '_init' /usr/lib/gcc/x86_64-redhat-linux/4.1.2/../../../../lib64/crti.o:(.init+0 x0): first defined here collect2: ld returned 1 exit status make: *** [extensions/libipt_TPROXY.so] Error 1 What should I do to fix this? (I am the centOS kernel src v2.6.18, squid 2.6stable20) Nick