I don't know when exactly was introduced RoundTo with two arguments.
But it exists in Delphi 7.
So
{$ifdef Delphi_2010}
{$define SUPPORT_ROUNDTO} // RoundTo was included with 2010 it seems
{$endif}
should be changed to
{$ifdef Delphi_7}
{$define SUPPORT_ROUNDTO}
{$endif}
Of course, not the directive SUPPORT_ROUNDTO wasn't included with D2010.
The RoundTo function wasn't included with D2010 but earlier.
I modified dbf_common.inc to define SUPPORT_ROUNDTO since Delphi 7.