Hello After a few years of not using this data set http://www.cave-registry.org.uk/svn/CheddarCatchment/ I compiled this file http://www.cave-registry.org.uk/svn/CheddarCatchment/thconfig and it didn't work, giving this error therion 6.2.1 (2024-03-20) therion: warning -- Proj version mismatch: using 9.5.0, compiled against 9.4.1 cavern - Survex 1.4.12 initialization file: /etc/therion.ini reading ... done This is pdfTeX, Version 3.141592653-2.6-1.40.26 (TeX Live 2025/dev/Debian) (preloaded format=pdftex) restricted \write18 enabled. entering extended mode (./fonttest.tex checking optional fonts csr10 csti10 csbx10 csss10 csssi10 ... NOT INSTALLED This is pdfTeX, Version 3.141592653-2.6-1.40.26 (TeX Live 2025/dev/Debian) (preloaded format=pdftex) restricted \write18 enabled. entering extended mode (./fonttest.tex checking optional fonts cmcyr10 cmcti10 cmcbx10 cmcss10 cmcssi10 ... NOT INSTALLED configuration file: thconfig reading ... done reading source files ... done preprocessing database ... done therion: error -- automatic declination calculation before 1900 not supported, please specify declination explicitly I have no idea how a date before 1900 got in there, but a clue on where it is would be useful! Is there anything I can do to find out? Not sure about the Proj version mismatch, I'm on Debian trixie. It does not seem to be causing problems thanks Andrew