[R] RPostgreSQL: unable to load shared library

Uwe Ligges ligges at statistik.tu-dortmund.de
Thu Oct 15 09:33:49 CEST 2009

Prof Brian Ripley wrote:
> On Wed, 14 Oct 2009, Fanfaar wrote:
>> Hello list,
>> I'm using R 2.9.2 on a WinXP system, and I installed the RPostgreSQL
>> library using the package installer. When trying to load it, I get the
>> following error:
>>> library('RPostgreSQL')
>> Error in inDL(x, as.logical(local), as.logical(now), ...) :
>>  unable to load shared library
>> 'C:/PROGRA~1/R/R/library/RPostgreSQL/libs/RPostgreSQL.dll':
>>  LoadLibrary failure:  The operating system cannot run %1.
>> Error: package/namespace load failed for 'RPostgreSQL'
>> So one way or the other, the DLL is not found... Does anyone know how
> That is not what it says: it says it cannot *load* the DLL.  You need 
> the PostgreSQL client dll in your path, and I guess that (or its 
> version) is the problem.  (Usually Windows gives you a popup with more 
> information, and indeed on my laptop it told me LIBPQ.DLL could not be 
> found.) And pedump suggests that it is linked against entry points by 
> number not name, a very fragile arrangement.
> I always worry that packages that link to external DLLs can be very 
> dependent on the version of that DLL (and see the above comment).  I 
> could not see a description of the version of PostgreSQL used on Uwe's 
> ReadMe (assuming this is a binary from CRAN), and suggest (as did the 

Good point, I will add that version 8.3.4-1 is used on CRAN.


> rw-FAQ) that you install RPostgreSQL from source against your own 
> PostgreSQL installation.  (That's what I do on my Windows desktop which 
> does have PostgreSQL installed, and when I updated PostgreSQL I had to 
> re-install PostgreSQL ....)
>> to fix this? I don't suppose DLL should be directly in my PATH, right?
>> Thanks for any hints,
>> Arnout
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> Yes another person who thinks that does not apply to them.

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