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

From: João Gonçalves <joaofgo_at_gmail.com>
Date: Tue, 29 Jun 2010 23:35:44 +0100


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?

I'm using R-2.11.1 on WinXP/7.

Best regards,
João Gonçalves.



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