[BioC] Rgraphviz installation failure with R 2.12.0

Mary Putt mputt at mail.med.upenn.edu
Fri Dec 17 15:48:33 CET 2010

I have the same installation problems on two 32 bit computers running 
Windows 7 or Windows XP. and R 2.12.0

The shared object RGraphviz.dll is where it is supposed to be.

Any suggestions greatly appreciated.

Thank you


 >   biocLite("Rgraphviz")
Using R version 2.12.0, biocinstall version 2.7.4.
Installing Bioconductor version 2.7 packages:
[1] "Rgraphviz"
Please wait...

trying URL 

Content type 'application/zip' length 1065188 bytes (1.0 Mb)
opened URL
downloaded 1.0 Mb

package 'Rgraphviz' successfully unpacked and MD5 sums checked

The downloaded packages are in
       C:\Documents and Settings\mputt\Local 

 > library("Rgraphviz")
Error : .onLoad failed in loadNamespace() for 'Rgraphviz', details:
 call: value[[3L]](cond)
 error: unable to load shared object 
 LoadLibrary failure:  The specified module could not be found.

 Check that (1) graphviz is installed on your system; (2) the installed 
version of graphviz matches '2.20.3'; this is the version used to build 
this Rgraphviz package; (3)
 graphviz is accessible to R, e.g., the path to the graphviz 'bin' 
directory is in the system 'PATH' variable.  See additional instructions 
in the 'README' file of the
 Rgraphviz 'source' distribution, available at


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Error: package/namespace load failed for 'Rgraphviz'

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