The problem is still happening in dapper, as far as I can see:
$ cat /etc/*release
DISTRIB_ID=Ubuntu
DISTRIB_RELEASE=6.06
DISTRIB_CODENAME=dapper
DISTRIB_DESCRIPTION="Ubuntu 6.06 LTS"
$ man open_memstream
man: warning: /usr/share/man/man3/open_memstream.3.gz is a dangling symlink
No manual entry
** Bug 57549 has been marked a duplicate of this bug
--
Symlink to missing manpage is installed.
https://launchpad.net/bugs/6416
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** Changed in: manpages (Debian)
Status: Unconfirmed => Fix Released
--
Symlink to missing manpage is installed.
https://launchpad.net/bugs/6416
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