MacOS: installed Zorba is not filesystem-independent

[Chris Hillery]

Executables and .dylibs in MacOS have hard-coded paths to the .dylibs they depend on, and using the default CMake install mechanism, these will be absolute paths. Hence, you cannot simply install Zorba to one directory and then move it to another later, because (at least) zorbacmd and all the module libraries refer to the original absolute path to libzorba.

There are a few ways to fix this using "install_name_tool", which lets you change these references. You can change them to relative paths using @loader_path, for instance. Also, if you install Zorba as a framework, you possibly have additional options.