keihatsu modules # gcc -o ip_cloaking.so ip_cloaking.c 
/usr/lib/gcc/x86_64-pc-linux-gnu/4.1.2/../../../../lib64/crt1.o: In function `_start':
(.text+0x20): undefined reference to `main'
/tmp/ccIWaCUk.o: In function `_modinit':
ip_cloaking.c:(.text+0xa): undefined reference to `user_modes'
ip_cloaking.c:(.text+0x2e): undefined reference to `user_modes'
ip_cloaking.c:(.text+0x89): undefined reference to `ilog'
ip_cloaking.c:(.text+0xa2): undefined reference to `sendto_realops_flags'
ip_cloaking.c:(.text+0xb0): undefined reference to `user_modes'
ip_cloaking.c:(.text+0xb5): undefined reference to `assemble_umode_buffer'
ip_cloaking.c:(.text+0xbc): undefined reference to `entering_umode_cb'
ip_cloaking.c:(.text+0xc6): undefined reference to `install_hook'
ip_cloaking.c:(.text+0xd4): undefined reference to `umode_cb'
ip_cloaking.c:(.text+0xde): undefined reference to `install_hook'
ip_cloaking.c:(.text+0xfb): undefined reference to `ilog'
ip_cloaking.c:(.text+0x114): undefined reference to `sendto_realops_flags'
/tmp/ccIWaCUk.o: In function `_moddeinit':
ip_cloaking.c:(.text+0x12f): undefined reference to `local_client_list'
ip_cloaking.c:(.text+0x177): undefined reference to `user_modes'
ip_cloaking.c:(.text+0x180): undefined reference to `assemble_umode_buffer'
ip_cloaking.c:(.text+0x187): undefined reference to `entering_umode_cb'
ip_cloaking.c:(.text+0x191): undefined reference to `uninstall_hook'
ip_cloaking.c:(.text+0x198): undefined reference to `umode_cb'
ip_cloaking.c:(.text+0x1a2): undefined reference to `uninstall_hook'
/tmp/ccIWaCUk.o: In function `make_virthost':
ip_cloaking.c:(.text+0x2b1): undefined reference to `strlcpy'
ip_cloaking.c:(.text+0x2c9): undefined reference to `strlcpy'
ip_cloaking.c:(.text+0x63f): undefined reference to `ircsprintf'
ip_cloaking.c:(.text+0x68b): undefined reference to `ircsprintf'
ip_cloaking.c:(.text+0x6f1): undefined reference to `ircsprintf'
ip_cloaking.c:(.text+0x73a): undefined reference to `ircsprintf'
ip_cloaking.c:(.text+0x7b6): undefined reference to `ircsprintf'
/tmp/ccIWaCUk.o:ip_cloaking.c:(.text+0x7ff): more undefined references to `ircsprintf' follow
/tmp/ccIWaCUk.o: In function `make_virthost':
ip_cloaking.c:(.text+0x815): undefined reference to `strlcpy'
/tmp/ccIWaCUk.o: In function `set_vhost':
ip_cloaking.c:(.text+0x8cd): undefined reference to `me'
ip_cloaking.c:(.text+0x8f5): undefined reference to `sendto_server'
ip_cloaking.c:(.text+0x915): undefined reference to `form_str'
ip_cloaking.c:(.text+0x927): undefined reference to `me'
ip_cloaking.c:(.text+0x931): undefined reference to `sendto_one'
/tmp/ccIWaCUk.o: In function `reset_ipv6err_flag':
ip_cloaking.c:(.text+0xa15): undefined reference to `pass_callback'
/tmp/ccIWaCUk.o: In function `h_set_user_mode':
ip_cloaking.c:(.text+0xc01): undefined reference to `me'
ip_cloaking.c:(.text+0xc10): undefined reference to `sendto_one'
ip_cloaking.c:(.text+0xc59): undefined reference to `pass_callback'
collect2: ld returned 1 exit status