Building osm2pgsql on Mac OS X using homebrew

General instructions are here: http://wiki.openstreetmap.org/wiki/Osm2pgsql#Mac_OS_X

Note: I'm running Snow Leopard (10.6.6 )

1. Install homebrew

Check that you don't have it already:

$ which brew

If you don't have homebrew install it from here:

https://github.com/mxcl/homebrew/wiki/installation

E.g. like this:

$ ruby -e "$(curl -fsSLk https://gist.github.com/raw/323731/install_homebrew.rb)"

2. Install proj

$ brew install proj
$ which proj
/usr/local/bin/proj

3. Install geos

$ brew install geos

4. Install osm2pgsql

First add pg_config to the path, then install osm2pgsql:

$ PATH=$PATH:/Library/PostgreSQL/9.0/bin/
$ brew install osm2pgsql
$ which osm2pgsql
/usr/local/bin/osm2pgsql

You should now have osm2pgsql installed.

Import OSM data into PostgreSQL

I did the following to import OSM data into PostgreSQL.

# create a user for the osm database
createuser -U postgres osm-user
# create the osm database
createdb -U postgres -E utf8 -O osm-user osm
# download som osm data from cloudmade.com, I chose Copenhagen, Denmark.
wget http://downloads.cloudmade.com/europe/northern_europe/denmark/copenhagen/copenhagen.osm.bz2
# unzip it
bzip2 -d copenhagen.osm.bz2
# install the mercator projection 900913 on the database
wget http://svn.openstreetmap.org/applications/utils/export/osm2pgsql/900913.sql
psql -U postgres -d osm -f 900913.sql
# install PostGIS on database
psql -U postgres -d osm -f /Library/PostgreSQL/9.0/share/postgresql/contrib/postgis.sql
# find the style to use with osm2pgsql 
brew list osm2pgsql # list locations installed by homebrew, including location of the default style
 
# Ready to import! use -s if you chose a large OSM dataset, this keeps RAM usage down.
# Use location of style file found with brew list osm2pgsql
osm2pgsql -d osm -U postgres -S /usr/local/Cellar/osm2pgsql/HEAD/share/osm2pgsql/default.style copenhagen.osm

You should now have some OSM data in your PostgreSQL database.