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pthread_mutex_init man page


In Debian 9, the
$ man pthread_mutex_init
command results in:
No manual entry for pthread_mutex_init.

Other pthread man pages (such as pthread_create, pthread_join, ...) are available.

The "manpages-posix-dev" non-free package is available to install the missing man pages.
Why are these pages separate from the others, and why are them not free?

Best regards,