I think I've missed a trick along the line somewhere...

Having built the latest gregorio/gregoriotex versions from the git repository 
master, when I run the LuaLaTex command from within TeXworks on a previously 
working main.tex with an \includescore it fails with an error about not finding 
a .gtex file and a suggestion to try 'lualatex --shell-escape main.tex'. (In 
fact I have already generated a .tex file from the .gabc score, but no .gtex 
file.)

Then if I run 'lualatex --shell-escape main.tex' from a command line a .gtex 
file is generated from the .gabc, and then after that the TeXworks LuaLaTex 
command successfully produces a .pdf output from the main.tex.

I suspect that somewhere in the code (perhaps in a .lua script) this 
--shell-escape option needs to be specified. 

I am compiling the gabc to tex with the plain gregorio command; I am not using 
the gregorio.engine script. But I don't think this is the problem. The problem 
appears to be that the LuaLaTex run needs somehow to be forced into the 
shell-escape mode. 

Another (related?) problem is that, with \includescore{XXX.tex}, I see in the 
log:
! LuaTeX error ...ocal/tex/UbuntuTexDir/luatex/gregoriotex/gregoriotex.lua:206: 
Module gregoriotex error: The file XXX.tex.gabc does not exist.

I think this failure to compile has only appeared in the past few days.

Many thanks for any clues,

Fr Bernard Marsh

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