//删除文件夹 RemoveDir; RemoveDirectory
var
dir: string;
begin
dir := 'c:\temp';
RemoveDir(dir); //返回 Boolean

//或者用系统 API:
RemoveDirectory(PChar(dir)); //返回 Boolean
end;

========================

function RemoveDir(const Dir: string): Boolean;
begin
{$IFDEF MSWINDOWS}
Result := RemoveDirectory(PChar(Dir));
{$ENDIF}
{$IFDEF LINUX}
Result := __rmdir(PChar(Dir)) = 0;
{$ENDIF}
end;