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(g77-295.info)POINTER Statements

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POINTER Statements
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   `g77' doesn't support pointers or allocatable objects (other than
automatic arrays).  This set of features is probably considered just
behind intrinsics in `PARAMETER' statements on the list of large,
important things to add to `g77'.

   In the meantime, consider using the `INTEGER(KIND=7)' declaration to
specify that a variable must be able to hold a pointer.  This construct
is not portable to other non-GNU compilers, but it is portable to all
machines GNU Fortran supports when `g77' is used.

   Note: Functions and Subroutines, for information on `%VAL()',
`%REF()', and `%DESCR()' constructs, which are useful for passing
pointers to procedures written in languages other than Fortran.