Xcode 4.2 mySQL connection architecture fail ld: warning: ignoring file /usr/local/mysql/lib/libmysqlclient.dylib, file was built for unsupported file format which is not the architecture being linked (i386) Undefined symbols for architecture i386: "_mysql_init", referenced from: -[ViewController mysql_connection] in ViewController.o "_mysql_real_connect", referenced from: -[ViewController mysql_connection] in ViewController.o ld: symbol(s) not found for architecture i386 clang: error: linker command failed with exit code 1 (use -v to see invocation)