[R] RPostgreSQL - Unable to locate required modules/DLLs on WinXP/7

[Dirk Eddelbuettel]

On Tue, Jun 29, 2010 at 11:35:44PM +0100, João Gonçalves wrote:
> Dear list users,
>
> The problem occurs when library(RPostgreSQL) is issued on R. This issue  
> has previously appeared on R mailing list without any robust solution.  
> The error message issued by R:
>
> Loading required package: RPostgreSQL
> Loading required package: DBI
> Error in inDL(x, as.logical(local), as.logical(now), ...) :
>   unable to load shared library  
> 'C:/PROGRA~1/R/R-210~1.1/library/RPostgreSQL/libs/RPostgreSQL.dll':
>   LoadLibrary failure:  Unable to locate the specified module.
> Error: package 'RPostgreSQL' could not be loaded
>
> At the same time an error box appears saying that a given DLL does not  
> exists which makes RPostgreSQL loading to fail. The message appears for  
> any of the following DLLs (that actually exist on  
> X:/PostgreSQL_installation_directory/bin):
>
> libpq.dll
> ssleay32.dll
> libeay32.dll
> libintl-8.dll
> libiconv-2.dll
> krb5_32.dll
> comerr32.dll
> k5sprt32.dll
> msvcr71.dll
> gssapi32.dll
>
> To "solve" this problem the actual DLLs from the PostgreSQL installation  
> directory must be copied into the X:/WINDOWS/System32 shared libraries  
> folder in order to make the package operational.
> Is there a way to solve this from the package internals without having  
> to copy the DLLs? Am I missing something here?

You are missing the correct use of the PATH environment variable.

> I'm using R-2.11.1 on WinXP/7.
>
> Best regards,
> João Gonçalves.
>
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