Source: libf2c2 Version: 20090411-2 This package is very old. Is anyone still using it? Does it get tested in any way?
The file https://sources.debian.net/src/libf2c2/20090411-2/f2c.h0/ contains (repeatedly) the line: #if defined(__alpha__) || defined(__sparc64__) || defined(__x86_64__) || defined(__ia64__) Seeing as the file hasn't been updated at least since 2009, if this package is not getting tested that list of architectures is likely to be incomplete. Question: Should __aarch64__ be in there (for arm64)? This file, too, has architecture-specific code: https://sources.debian.net/src/libf2c2/20090411-2/uninit.c/
