Hi, so I haven't upgraded to 10.14 yet (it's prevented at our office) so I haven't been able to test this directly. But another user reported some issues overlapping with yours, which I think he solved by upgrading Xcode and Xcode command line tools. Did you check through the App Store that you have upgraded Xcode to the latest version? Also, within Xcode please also make sure the latest command line tools are installed.
But it may also be that we will need to update lapack_wrap.cc to be compatible with OSX 10.14. Thanks for reporting this either way.