I think there is a bug in the (latest) beta (2014.07.30 10:31 MKIV beta
fmt: 2014.8.2  int: english/english) that was *not* there earlier
this year! 

Please, could somebody help and maybe provide a tip for a workaround?

It concerns the integration with tikz where I get now the following
error message:

util-lib.lua:246: module 'pgf.gd.control' not found:
        no field package.preload['pgf.gd.control']
        no file '/usr/local/share/lua/5.2/pgf/gd/control.lua'
        no file '/usr/local/share/lua/5.2/pgf/gd/control/init.lua'
        no file '/usr/local/lib/lua/5.2/pgf/gd/control.lua'
        no file '/usr/local/lib/lua/5.2/pgf/gd/control/init.lua'
        no file './pgf/gd/control.lua'
        no file '/usr/local/lib/lua/5.2/pgf/gd/control.so'
        no file '/usr/local/lib/lua/5.2/loadall.so'
        no file './pgf/gd/control.so'
        no file '/usr/local/lib/lua/5.2/pgf.so'
        no file '/usr/local/lib/lua/5.2/loadall.so'
        no file './pgf.so'
stack traceback:
        [C]: in function 'savedrequire'
        .../context/tex/texmf-context/tex/context/base/util-lib.lua:246:
in function
'require' ...neric/pgf/graphdrawing/lua/pgf/gd/control/Sublayouts.lua:41:
in main chunk [C]: in function
'savedrequire' .../context/tex/texmf-context/tex/context/base/util-lib.lua:246:
in function
'require' ...graphdrawing/lua/pgf/gd/interface/InterfaceToDisplay.lua:45:
in main chunk [C]: in function
'savedrequire' .../context/tex/texmf-context/tex/context/base/util-lib.lua:246:
in function 'require' [\directlua]:1: in main chunk

1101     }
1102     }
1103     
1104     
1105     %
1106     % Ok, fire up the system by creating the binding!
1107     %
1108     \directlua{
1109       require 'pgf.gd.interface.InterfaceToDisplay' 
1110       pgf.gd.interface.InterfaceToDisplay.bind(require
'pgf.gd.bindings.BindingToPGF') 1111 >>  } 



A minimal example is:

\usemodule[tikz]
\usetikzlibrary[graphs]
\usetikzlibrary[graphdrawing]

\starttext

\starttikzpicture
\graph { a -> {b, c} -> d };
\stoptikzpicture

\stoptext

Günter
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