I'd like to specify a minimum gcc version rather than an exact version. Is that possible?

I know this works:

  exe myExe : src1.cc src2.cc : <toolset-gcc:min-version>6.0.0:<define>DEFINE1 ; 

And also this:

  exe myExe : src1.cc src2.cc : <toolset>gcc-6.0.0:<define>DEFINE1 ;  

What I'd like:

  exe myExe : src1.cc src2.cc : <toolset-gcc:min-version>6.0.0:<define>DEFINE1 ;

Or

  exe myExe : src1.cc src2.cc : <min-toolset>gcc-6.0.0:<define>DEFINE1 ;  

Thanks,

Uri