I think I saw a recent commit message about charset.alias file.

When using pkgviews I saw a message like:

=> Performing package view overwrite check for gettext-0.11.5nb4 in
standard view
***********************************************************
**** The following symbolic links will be overwritten *****
-r--r--r--  1 root  wheel  2185 Apr 16 16:54 /usr/pkg//lib/charset.alias


See how it is available multiple times:

reed@tahoma:/usr/pkgsrc/devel/gettext$ ls -l
/usr/pkg/packages/*/lib/charset.alias
-r--r--r--  1 root  wheel  2180 Apr 26 08:37
/usr/pkg/packages/gettext-0.11.5nb4/lib/charset.alias
-r--r--r--  1 root  wheel  2180 Apr 24 20:48
/usr/pkg/packages/gettext-lib-0.11.5nb3/lib/charset.alias
-rw-r--r--  1 root  wheel  2173 Apr 16 11:46
/usr/pkg/packages/libiconv-1.9.1nb1/lib/charset.alias

   Jeremy C. Reed
   http://www.reedmedia.net/