program testguibuild; {$mode objfpc}{$H+} uses heaptrc, {$IFDEF UNIX}{$IFDEF UseCThreads} cthreads, {$ENDIF}{$ENDIF} Interfaces, // this includes the LCL widgetset Forms, mainform, cmdlinelclctrlsbox//, patheditor { you can add units after this }; {$R *.res} begin SetHeapTraceOutput('test.txt'); RequireDerivedFormResource := True; Application.Initialize; Application.CreateForm(TForm1, Form1); Application.Run; end.