If the user happens to have an environment variable 'S' set, then the manual page installation fails under 'make install'. I needed to 'unset S' to get my man pages. I haven't experienced this before (8.4.11 was last version used). Same exact thing happens with tk 8.4.15.
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user_id=68433
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Problem is in the "installManPage" shell script (see #996085), which uses shell variables "S", "Z", "SUFFIX" (and maybe a few others) but doesn't always initialize them.
This has meanwhile been fixed in CVS for 8.5 and HEAD.