Can we access variables defined in header files here?

[jishnub]

The docs of fits_insert_img states

One can force a new primary array to be inserted at the beginning of the FITS file by setting status = PREPEND_PRIMARY

except PREPEND_PRIMARY is defined in a header file as

#define PREPEND_PRIMARY    -9  /* used in ffiimg to insert new primary array */

and I don't think that this is exported (I can't find a corresponding symbol exported when I run nm on the library). Perhaps we may just hardcode the symbol here, but is there any other way to access the symbol from the header file?