pathmap old-prefix new-prefix

If a file cannot be found using the path_list set by addpath or setpath, you can specify one or more path remappings with the pathmap command. In any pathname for a source file, object file, or shared object that begins with the prefix specified with old-prefix, the old prefix is replaced by the prefix specified with new-prefix. The resulting path is then used to find the file. Multiple pathmap commands can be supplied, and each is tried until the file is found.