[Lazarus] Forward declaration not solved

[Antonio Fortuny]

Hi Folks.

Moving some units from Delphi to FPC-Lazarus, the FPC compiler tells me 
something I do not understand:
Platform is Linux_x64,  Lazarus 1.0.8 FPC 2.6.2, gtk2
Project options have been set to Obj Pascal (mdelphi removed)

interface
     uses ...

[324]    function OpenLongFileName(const ALongFileName: String; const 
SharingMode: Integer): THandle;

implementation

uses ...

function OpenLongFileName(const ALongFileName: String; const 
SharingMode: Integer): THandle;
begin
   if not FileExists(ALongFileName) then begin
     with TStringList.Create do try
       Clear;
       SaveToFile(ALongFileName);
     finally
       Free
     end;
   end;
   Result := FileCreate(ALongFileName, fmOpenReadWrite, SharingMode);
end;

compiler says:

clamav3.pas(324,12) Error: Forward declaration not solved 
"OpenLongFileName(const AnsiString,const LongInt):QWord;"

Any comment ?

Thanks,

Antonio.
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