> There's probably a better way to do it, but I don't know how. At least

quoted text
> this works.

Here's mine.  This is covered in man.conf(5).. :)
--- man.conf.orig	Wed Mar 26 15:52:28 2008

+++ man.conf	Wed Mar 26 16:21:48 2008

@@ -7,9 +7,11 @@

 _whatdb		/usr/share/man/whatis.db

 _whatdb		/usr/local/man/whatis.db

 _whatdb		/usr/X11R6/man/whatis.db

+_whatdb		/usr/local/lib/tcl8.4/man/whatis.db

+_whatdb		/usr/local/lib/tk8.4/man/whatis.db
 # Subdirectories for paths ending in '/', IN SEARCH ORDER.

-_subdir		cat1 man1 cat8 man8 cat6 man6 cat2 man2 cat3 man3 cat5 man5 cat7 man7 cat4 man4 cat9 man9 cat3p man3p cat3f man3f

+_subdir		cat1 man1 cat8 man8 cat6 man6 cat2 man2 cat3 man3 cat5 man5 cat7 man7 cat4 man4 cat9 man9 cat3p man3p cat3f man3f mann
 # Files typed by suffix and their commands.

 # Note the order: .Z must come after .[1-9n].Z, or it will match first.

@@ -33,17 +35,19 @@

 # directory with all of the subdirectories listed for the keyword _subdir.
 # default

-_default	/usr/{share,X11R6,local}/man/

+_default	/usr/{share,X11R6,local,local/lib/tcl8.4,local/lib/tk8.4}/man/
 # Other sections that represent complete man subdirectories.

 X11		/usr/X11R6/man/

 X11R6		/usr/X11R6/man/

 local		/usr/local/man/

+tcl		/usr/local/lib/tcl8.4/man/

+tk		/usr/local/lib/tk8.4/man/
 # Specific section/directory combinations.

-1		/usr/{share,X11R6,local}/man/{cat,man}1

+1		/usr/{share,X11R6,local,local/lib/{tcl,tk}8.4}/man/{cat,man}1

 2		/usr/{share,X11R6,local}/man/{cat,man}2

-3		/usr/{share,X11R6,local}/man/{cat,man}3

+3		/usr/{share,X11R6,local,local/lib/{tcl,tk}/man/{cat,man}3

 3F		/usr/local/man/{cat,man}3f

 3f		/usr/local/man/{cat,man}3f

 3P		/usr/{share,local}/man/{cat,man}3p

@@ -54,3 +58,4 @@

 7		/usr/{share,X11R6,local}/man/{cat,man}7

 8		/usr/{share,X11R6,local}/man/{cat,man}8

 9		/usr/share/man/{cat,man}9

+n		/usr/local/lib/{tcl,tk}8.4}/man/mann