Undefined symbols for architecture x86_64

What is going on here? I can't seem to build with gcc. How can I fix this.

mbp-mbp 09:24:18 ~/bin $ gcc connect.c -o connect

Undefined symbols for architecture x86_64:

"_res_9_init", referenced from:

_switch_ns in ccTLCqYq.o

ld: symbol(s) not found for architecture x86_64

collect2: error: ld returned 1 exit status

mbp-mbp 09:26:14 ~/bin $ gcc -v

Using built-in specs.

COLLECT_GCC=gcc

COLLECT_LTO_WRAPPER=/usr/local/Cellar/gcc/4.8.3/libexec/gcc/x86_64-apple-darwin1 3.2.0/4.8.3/lto-wrapper

Target: x86_64-apple-darwin13.2.0

Configured with: ../configure --build=x86_64-apple-darwin13.2.0 --prefix=/usr/local/Cellar/gcc/4.8.3 --enable-languages=c,c++,objc,obj-c++,fortran --with-gmp=/usr/local/opt/gmp --with-mpfr=/usr/local/opt/mpfr --with-mpc=/usr/local/opt/libmpc --with-cloog=/usr/local/opt/cloog --with-isl=/usr/local/opt/isl --with-system-zlib --enable-version-specific-runtime-libs --enable-libstdcxx-time=yes --enable-stage1-checking --enable-checking=release --enable-lto --disable-werror --enable-plugin --disable-nls --enable-multilib

Thread model: posix

gcc version 4.8.3 (GCC)

5.1.1 xcode nad command line tools

OSX 10.9.3

Cheers