lazarus-1.2-4.fc21.i686
I don't understand this version identifier. It could be that your fpc version is too old. The function VarIsBool was introduced only in the latest stable version 2.6.4. To fix this open the file fps.inc in the fpspreadsheet installation folder and activate the define FPS_VARISBOOL - this uses a local copy of this function in unit fpsfixes.
This is lazarus version and you talk about free pascal compiler version.
$ rpm -q fpc
fpc-2.6.2-7.fc21.i686
Your advice helped, thanks.
If I found any other bugs can I write in this forum? Or special bugtracker exists?