The SAGA Adaptor libaries include and link against some external 3rd party
libraries. In order to make the XCode build system work, you have to set 
the appropriate environemnt variables within XCode.
  
saga_default_adaptors
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  Right click on the project root saga_default_adaptors, select 'Get Info'
  and select the 'Build' tab. Make sure 'Configuration' is set to 'All
  Configurations', find the list entry BOOST_LOCATION and set it to the 
  appropriate value:
  
  - BOOST_LOCATION     (default: /sw)
    This variable must point to the base directory of your Boost C++ Libraries
    installation. Normally it should be /sw if you installed Boost via Fink.


saga_globus_adaptors
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  Right click on the project root saga_globus_adaptors, select 'Get Info'
  and select the 'Build' tab. Make sure 'Configuration' is set to 'All
  Configurations', find the list entries GLOBUS_LOCATION as well as 
  GLOBUS_FLAVOR and set them to the appropriate values:

  - GLOBUS_LOCATION     (default: /usr/local/globus-4.0.3)
    This variable must point to the root directory of you Globus Toolkit 4 
    installation.
    
  - GLOBUS_FLAVOR       (default: gcc32dbg)
    This variable must contain the name of the installed Globus flavor you 
    want to use (look in GLOBUS_LOCATION/include for installed flavors).