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...

xsubpp
-typemap "...lib\ExtUtils\typemap"
-typemap "...inline-c-mytypemap-null\mytypemap.txt"

typemap typemap

    Indicates that a user-supplied typemap should take precedence over
+ the default typemaps. This option may be used multiple times, with t
+he last typemap having the highest precedence.

#!/usr/bin/perl --
use strict;
...

__END__

## cannot redefine T_PTR INPUT/OUTPUT
#  unmapped     T_PTR
...
T_PTR
    sv_setiv($arg, BROKEN_PTR2IV($var));

#!/usr/bin/perl --
use strict;
...


__END__