You can specify the location of the data file using the logical name
   CXX$DEMANGLER_DB.  For example, if the data file is in your login directory
   and is named MYCXXDB.DAT, you would define the CXX$DEMANGLER_DB logical
   name as follows:

      $ DEFINE CXX$DEMANGLER_DB SYS$LOGIN:MYCXXDB.DAT

   If you do not define the CXX$DEMANGLER_DB logical name, CXXDEMANGLE
   looks for the data file in the repositories specified by the /REPOSITORY
   qualifier.  If you do not specify the /REPOSITORY qualifier, CXXDEMANGLE
   looks for the data file in the sys$disk:[.cxx_repository] directory.