===>  Installing for boo-0.7.9.2659_1
===>   boo-0.7.9.2659_1 depends on executable: mono - found
===>   Generating temporary packing list
===>  Checking if lang/boo already installed
NAnt 0.85 (Build 0.85.2478.0; release; 10/14/2006)
Copyright (C) 2001-2006 Gerry Shaw
http://nant.sourceforge.net


BUILD FAILED

The current runtime framework 'mono-2.0' is not correctly configured in the NAnt configuration file.
    Function call failed.
Expression: ${path::combine(prefix, 'lib/mono/1.0')}
              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
        Illegal characters in path
Parameter name: path1

For more information regarding the cause of the build failure, run the build again in debug mode.

Try 'nant -help' for more information
Thread 801401400 has exited with leftover thread-specific data after 4 destructor iterations
*** Error code 1

Stop in /a/ports/lang/boo.
================================================================
build of /usr/ports/lang/boo ended at Sat Oct 27 04:38:40 UTC 2007