[Therion] input not working in thconfig

Philip Schuchardt wrote:

This is how you overload metapost symbols.

######### thconfig file ########### input layout.th source main.th

#One page map export map -layout plan -output ABC.pdf export map -layout print -output ABC_Printable.pdf

After see this I thought I would try to rashionlise the thconfig files I have, so others can follow my logic, but trying to include a file using the input command in a thconfig file gives this error. C:\Program Files\Therion\therion.exe: error -- thconfig [63] -- thconfig [63] -- unknown option -- input common_layout.th The Therion book just says it should work, what have I done wrong? The files are available from http://mulucaves.org/Eagleramp.zip thanks Andrew