Implicit declaration of Function

I upgraded from Labwindows 2008 to 2013

When I now build my project in Labwindows 2013 I am getting many errors like these:

  236, 5    error: implicit declaration of function 'GPS_DisplayErrorStatistics' is invalid in C99. Make sure that you include the function prototype. [-Wimplicit-function-declaration]

  246, 5    error: implicit declaration of function 'BER_DisplayErrorStatistics' is invalid in C99. Make sure that you include the function prototype. [-Wimplicit-function-declaration]

  256, 5    error: implicit declaration of function 'NDAT_DisplayErrorStatistics' is invalid in C99. Make sure that you include the function prototype. [-Wimplicit-function-declaration]

No problem when I build the project using Labwindows 2008

errorStat.h

void GPS_DisplayErrorStatistics( int displayIfZero );

void BER_DisplayErrorStatistics( int displayIfZero );

void NDAT_DisplayErrorStatistics( int displayIfZero );

errorStat.c

/****************************************************************************************/
/*                                                                                                                          */
/*  Display any BER errors which may have been detected during collection     */
/*                                                                                                                          */
/****************************************************************************************/
void BER_DisplayErrorStatistics( int displayIfZero )
{
 ProcessError(BER_Stats.bytecount_errors, "Data Byte Count Errors");
 ProcessError(BER_Stats.checksum_errors, "Checksum Errors");
 ProcessError(BER_Stats.BER_errors , "BER Unreasonable Errors");
 ProcessError(BER_Stats.MSE_errors, "MSE Unreasonable Errors");
 ProcessError(BER_Stats.SNR_errors, "SNR Unreasonable Errors");

}

Calling function in other file

/***************************************************************************************/
/*                                                                                                                         *
/*  Analyze BER statistics                                                                                  */
/*                                                                                                                         */
/***************************************************************************************/
void AnalyzeBER( void )
{
 BER_DisplayErrorStatistics( FALSE );
}

What can be wrong?

Thanks!

John W.