sourcepath directory
Use the sourcepath statement to define the location of the project and its workfiles.
Either relative or full paths can be specified with the keyword. Relative paths are considered relative to the directory containing the .mmp file. Full paths are considered relative to the location defined by the EPOCROOT variable.
Multiple sourcepath statements may be specified, but note that the build tools will expect subsequent source and resource file statements to relate to the last previous sourcepath statement.