It looks like buildmagic is incompatible with ant 1.7 because even though I have updated the version check to allow 1.7, it seems as though the ant.version property is not set:
init: _buildmagic:modules:most: ====================================================================== == Executing 'most' in module 'main'... == _buildmagic:init: BUILD FAILED /Users/svn/JBossHead/jboss-head/tools/etc/buildmagic/buildmagic.ent:31: Unsupported Ant version: ant.version=${ant.version} Please install a version which is compatible with Ant 1.5 or 1.6. Total time: 1 second