I was using MacPorts to install ICU and Jam. After running the installer for the first time I got the following error message: [code]sudo port install icu jam Error: Target org.macports.build returned: shell command ” cd “/opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_release_ports_devel_icu/work/icu/source” && gnumake all ” returned error 127 Command output: sh: gnumake: command not found [/code] Oops forgot to install XCode (you always forget to install something on a new machine :)). Quickly ran the XCode installer, however when I ran the command again I got a new error: [code]sudo port install icu jam —> Building icu Error: Target org.macports.build returned: shell command ” cd “/opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_release_ports_devel_icu/work/icu/source” && gnumake all ” returned error 2 Command output: gnumake: *** No rule to make target `all’. Stop. [/code] Turns out you need to do a cleanup before attempting to run the command again: [code]sudo port clean –work icu —> Cleaning icu sudo port clean –work jam —> Cleaning jam sudo port install icu jam —> Fetching icu —> Verifying checksum(s) for icu —> Extracting icu —> Configuring icu —> Building icu —> Staging icu into destroot —> Installing icu @4.0_0 —> Activating icu @4.0_0 —> Cleaning icu —> Fetching jam —> Attempting to fetch jam-2.5.tar from http://distfiles.macports.org/jam/2.5 —> Verifying checksum(s) for jam —> Extracting jam —> Applying patches to jam —> Configuring jam —> Building jam —> Staging jam into destroot —> Installing jam @2.5_1 —> Activating jam @2.5_1 —> Cleaning jam [/code] Time to continue the Mapnik install.