All RDML-generated applications must be linked with the RDML Run-
    Time Library (SYS$LIBRARY:RDMLRTL.OLB). This library contains
    code for various functions and procedures needed for the code
    generated by RDML. To link RDML applications, use the following
    line in an options file or command file.

    SYS$LIBRARY:RDMLRTL.OLB/LIBRARY

    For example, if you include the preceding line in an options file
    named RDMLOPT.OPT, you can link a preprocessed and compiled RDML
    /PASCAL or RDML/C program by entering:

    $ LINK myprogram, rdmlopt/OPTIONS