Some Fortran compilers, including g77, let the user declare OPEN( ... NAME=). This is invalid standard Fortran syntax and is not supported by gfortran. OPEN( ... NAME=) should be replaced with OPEN( ... FILE=).
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https://gcc.gnu.org/onlinedocs/gcc-10.2.0/gfortran/OPEN_0028-_002e_002e_002e-NAME_003d_0029.html