- TLPDB and tlmgr.log are located in /var/db/tlpkg.
- "tlmgr conf texmf" modifies /var/db/tlpkg/texmf.cnf.
libkpathsea looks up it first if it exists and ignore the standard ones
in PREFIX/share/texmf-dist/web2c/texmf.cnf or
PREFIX/share/texmf-local/web2c/texmf.cnf.
- "tlmgr update" can still break consistency of the installed texmf-*
hierarchy by FreeBSD Ports Collection if it runs by root.
