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While reviewing mingw-cfitsio, we encountered the situation of bison
parser sources  containing the following:
/* [... standard GPLv3+ header ...] */
/* As a special exception, you may create a larger work that contains
part or all of the Bison parser skeleton and distribute that work
under terms of your choice, so long as that work isn't itself a
parser generator using the skeleton or a modified version thereof
as a parser skeleton. Alternatively, if you modify or redistribute
the parser skeleton itself, you may (at your option) remove this
special exception, which will cause the skeleton and the resulting
Bison output files to be licensed under the GNU General Public
License without this special exception.
This special exception was added by the Free Software Foundation in
version 2.2 of Bison. */
cfitsio is licensed MIT. Is my understanding correct that this special
exception means that these files are also MIT licensed, being
distributed as part of cfitsio, and hence that the license field of the
package only needs to specify MIT?