( edit: Actually, cfitsio has a f77 interface included.) I think it would be nice to have a stable and up-to-date bindings as a part of the ecosystem (whether they make it into stdlib or not) but I see absolutely no need to put any effort in implementing a worse version of what is already done. All of them mature, stable and insanely easy to use by iso_c_binding (or even to wrap in a derived type). I personally used libgdal, libpng and cfitsio in my field (from Fortran). I see no value of having a ppm implementation but maybe my opinion is isolated. PPM is short for "i don't feel like googling libpng manual". But is reading and writing ppm's worth the burden of the maintenance? Don't get me wrong but it's not a serious image format.
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