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I need to correct this lines but Harbour not found these function

Error: Unresolved external '_HB_FUN_FREADLINE' referenced from C:\WORK\ERRORI\IP_COMPUTER\OBJ\TEST.OBJ
Error: Unresolved external '_HB_FUN_FDELETE' referenced from C:\WORK\ERRORI\IP_COMPUTER\OBJ\TEST.OBJ


IF FILE( "temp_output.txt" )
nHandle := FOpen( "temp_output.txt", FO_READ )
IF nHandle >= 0
DO WHILE !HB_FEOF( nHandle )
cLine := FReadLine( nHandle )
cOutput += cLine + CRLF
ENDDO
FClose( nHandle )
ENDIF

FDelete( "temp_output.txt" )
ENDIF