With this method you will not be able to use delve's native backend, *but you don't need it anyway*: the native backend on macOS [has known problems](https://github.com/derekparker/delve/issues/1112) on recent issues of the OS and is not currently maintained.
2. On macOS 10.14 manually install the legacy include headers by running `/Library/Developer/CommandLineTools/Packages/macOS_SDK_headers_for_macOS_10.14.pkg`
3. Clone the repo into `$GOPATH/src/github.com/derekparker/delve`