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Mark James Adams http://raysend.com/mark/

Install postgres gem on Mac OS X 10.5 (Leopard)

When upgrading or installing recent versions of the postgres ruby gem on Leopard the following error appears

	===========   WARNING   ===========

		You are building this extension on OS X without setting the
		ARCHFLAGS environment variable, and PostgreSQL does not appear
		to have been built as a universal binary. If you are seeing this
		message, that means that the build will probably fail.

		Try setting the environment variable ARCHFLAGS
		to '-arch i386' before building.

		For example:
		(in bash) $ export ARCHFLAGS='-arch i386'
		(in tcsh) $ setenv ARCHFLAGS '-arch i386'

		Then try building again.

		===================================


The trick is to set the ARCHFLAGS variable inside the sudo command using env.

sudo env ARCHFLAGS="-arch i386" gem install postgres

Install RdbiPgSQL package for R on OS X

Connecting R to Postgres on OS X is a little bit of a hassle given where OS X looks for the libraries to link to.

Assuming you've installed Postgres via MacPorts, add shell variables for your Postgres lib and include directories to ~/.profile

export PG_LIB_DIR=/opt/local/lib/postgresql82
export PG_INCLUDE_DIR=/opt/local/include/postgresql82


Add a link from the OS X SDK directory to /opt

$ sudo ln -s /opt/ /Developer/SDKs/MacOSX10.4u.sdk/opt


Then install RdbiPgSQL as you would normally.

If the install fails because R isn't picking up the PG_LIB_DIR, _INCLUDE_DIR variables, keep a lookout for the lines in the install error output that look like


The downloaded packages are in
	/tmp/RtmpTakYpZ/downloaded_packages


In Terminal, change to this directory, replacing the 'RtmpTakYpZ' string with whatever directory the error output gives. Then run the R install command on the package file:

$ cd /tmp/RtmpTakYpZ/downloaded_packages
$ sudo R CMD INSTALL RdbiPgSQL_1.10.0.tar.gz