I am trying to build a project that was running ok on XCode 6 but I get the error
failed: No such file or directory (2)
Try to copy the file to that folder:
cp ~/old_path/libswiftSecurity.dylib ~/Applications/Xcode-beta.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/lib/swift/iphonesimulator
Maybe this is only a problem of yours. It should be solved.