[Boost-build] How do I determine what non-free properties need to be specified?

From: eh-boost.build_at_[hidden]
Date: 2007-11-16 11:40:31

I received the following error message this morning:

>c:/Development/Boost/source-1.34.1/tools/build/v2/build\project.jam:600: 
>in object(project-attributes)@13.set from module object(project-attributes)@13
>error: usage-requirements <toolset>gcc have non-free properties <toolset>gcc
>c:/Development/Boost/source-1.34.1/tools/build/v2/build\project.jam:871: 
>in project from module 
>Jamfile</c:/Development/Boost/build-1.34.1/cygwin-gcc3-for-mingw>
>project-root.jam:12: in modules.load from module 
>Jamfile</c:/Development/Boost/build-1.34.1/cygwin-gcc3-for-mingw>
>c:/Development/Boost/source-1.34.1/tools/build/v2/build\project.jam:312: 
>in load-jamfile from module project
>c:/Development/Boost/source-1.34.1/tools/build/v2/build\project.jam:68: in 
>load from module project
>c:/Development/Boost/source-1.34.1/tools/build/v2/build\project.jam:170: 
>in project.find from module project
>c:/Development/Boost/source-1.34.1/tools/build/v2\build-system.jam:237: in 
>load from module build-system
>c:\Development\Boost\build-1.34.1\..\source-1.34.1\tools\build\v2/kernel\modules.jam:261: 
>in import from module modules
>c:\Development\Boost\build-1.34.1\..\source-1.34.1\tools\build\v2/kernel/bootstrap.jam:132: 
>in boost-build from module
>c:\Development\Boost\build-1.34.1\boost-build.jam:1: in module scope from 
>module

1) Are there mandatory properties that need to be set in <toolset>gcc 
before specifying it?  If so, I only have surmised correctly because the 
error message uses bjam-specific jargon which I've had to learn.

2) How do I determine what those properties are?

Eric