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Re:I Didn’t Learn Unix by Reading All the Manpages by quesera on Wednesday May 24, 2023 @11:16PM (#36066717)
I don't think that's a macOS bug. Your terminal emulation might be borked.

What terminal are you using? I just tested on Terminal.app and iTerm2.app -- `man fopen` looks correct on both.

Re:I Didn’t Learn Unix by Reading All the Manpages by jerrysievert on Friday May 26, 2023 @12:46AM (#36080059)
iterm2.app - but I also use fish as my shell

TERM=xterm-256color and LESS_TERMCAP_us=In

Re:I Didn’t Learn Unix by Reading All the Manpages by iamthad on Friday May 26, 2023 @09:47PM (#36091336)
Your LESS_TERMCAP_us is the issue here; it's literally putting "In" wherever an underline is supposed to start.