PostgreSQL

RdbiPgSQL is available as source, and even with
export PG_LIB_DIR=/usr/local/pgsql/lib/ and
export PG_INCLUDE_DIR=/usr/local/pgsql/include/
fails to install with the following messages:

The downloaded packages are in
     /private/tmp/RtmpzKE7wz/downloaded_packages
checking for PQconnectdb in -lpq... no

I could not find your PostgreSQL client libraries!
Use --with-pgsql-libraries=PATH; if running R's INSTALL,
use --configure-args='--with-pgsql-libraries=PATH'; or
set PG_LIB_DIR in your environment to the library path,
and rerun the configure/install.

I have not installed this on my mac in a while, but my guess is that  
while these variables are set in you environment, they are not  
available in R for some reason.

You could check whether they are set in the session by looking at  
Sys.getenv()

If they are not there, I would try setting them directly in your R  
session before installing.  I think you would do that with:

Sys.setenv("PG_LIB_DIR"="/usr/local/pgsql/lib")
Sys.setenv("PG_INCLUDE_DIR"="/usr/local/pgsql/include")

But I could be off on whether the variable names need to be quoted.

Jim