Sounds to me like a man command which doesn't recognize the nroff comment statements in the .n file.
Package: tk-tile Version: 0.8.2-2.1 Severity: normal [6]matica:~$ man 3tcl frame man: ignoring unknown preprocessor `C' man: ignoring unknown preprocessor `o' man: ignoring unknown preprocessor `y' man: ignoring unknown preprocessor `i' man: ignoring unknown preprocessor `h' From: Ian Zimmerman <i...@buug.org> To: Debian Bug Tracking System <sub...@bugs.debian.org> Cc: Sent: Sunday, January 30, 2011 12:56 PM Subject: [Pkg-tcltk-devel] Bug#611558: tk-tile: broken manpage