Running examples in ‘ingres-Ex.R’ failed
The error most likely occurred in:

> base::assign(".ptime", proc.time(), pos = "CheckExEnv")
> ### Name: ginmlToGraphml
> ### Title: Convert a GinSim file into a GraphML file GinSim files have the
> ###   extension .zginml. This utility function converts such files into the
> ###   GraphML format. keeping the kind - fate, input or gene -, the edge
> ###   sign and the rule - formulae - data.
> ### Aliases: ginmlToGraphml
> 
> ### ** Examples
> 
> filename =
+   system.file("extdata", "example_ginsim.zginml", package = "ingres")
> head(ginmlToGraphml(filename))
Error: Cannot open file for writing:
* '/home/hornik/tmp/R.check/r-devel-gcc/Work/build/Packages/ingres/extdata/example_ginsim.graphml'
Execution halted
Package required but not available: ‘viper’

Package suggested but not available for checking: ‘aracne.networks’

See section ‘The DESCRIPTION file’ in the ‘Writing R Extensions’
manual.
Package suggested but not available for checking: 'aracne.networks'
Package required but not available: ‘viper’

Package suggested but not available for checking: ‘aracne.networks’

See section ‘The DESCRIPTION file’ in the ‘Writing R Extensions’
manual.