Can't build on OSX

I've downloaded the latest version of the MariaDB C client library. I ran `cmake CMakeLists.txt` to generate a Makefile and when I run that Makefile I get the error:

`
Linking C shared library libmariadb.dylib
Undefined symbols for architecture x86_64:
"_libiconv", referenced from:
_mariadb_convert_string in my_charset.c.o
"_libiconv_close", referenced from:
_mariadb_convert_string in my_charset.c.o
"_libiconv_open", referenced from:
_mariadb_convert_string in my_charset.c.o
ld: symbol(s) not found for architecture x86_64
clang: error: linker command failed with exit code 1 (use -v to see invocation)
make[2]: *** [libmariadb/libmariadb.1.dylib] Error 1
make[1]: *** [libmariadb/CMakeFiles/libmariadb.dir/all] Error 2
make: *** [all] Error 2
`

This also happens if I try to build `libmariadb`. The only way I can build the library is by building `mariadbclient`, but when I try to include that on an Xcode project it fails with the error above. Adding libiconv.dylib to the project won't change anything.