When doing the build the samples processing gets as far as the 'survex' folder and things go wrong: therion 5.3.11 initialization file: /etc/therion.ini reading ... done configuration file: thconfig.1 reading ... done reading source files ... done preprocessing database ... therion: error -- file import -- cave1.th [11] -- unable to open file cave1.th definitely exists. why would 'source cave1.th' fail? ownership and permissions are OK running therion thconfig.1 again produces the above output. similarly in the survex/use dir: therion 5.3.11 initialization file: /etc/therion.ini reading ... done configuration file: thconfig.1 reading ... done reading source files ... done preprocessing database ... therion: error -- file import -- cave1.th [11] -- unable to open file source foo.th has just worked fine in q-marks and pocket-topo and morphing/sample1 etc. I am perplexed. Wookey -- Principal hats: Linaro, Emdebian, Wookware, Balloonboard, ARM http://wookware.org/