Bravo !
I was surprised and pleased to discover the title “Compile M_intrinsics, fman, and gtk-fortran packages with LFortran”. Indeed, once in a while I am trying to compile gtk-fortran with LFortran in my Fedora. Last time was with the 0.56 version. But a few types were still missing in the ISO_C_BINDING support. I am eager to see your progress!