@Rouben Rostamian  I just installed the gmp library from Macports. And I changed the line as you wrote, but still, it is not installed. I do not know what else is I missing.

@Rouben Rostamian  Thank you! I finally realize what is the problem, I did not install gmp library or the openmp. Where should I download it? there is no link for it.  I googled " sudo port install gmp", but comes up several webpages. I don't know what to do. I am not a CS major, all these terminologies seem confusing to me.

@acer Thank you for your reply. I unpacked the content and there is a file named "12627", inside "12627" there is a file named"FGblib", and inside"FGblib" there are three files named "FGblib.lib","FGblib.ind","FGblib.hdb" that I think are the core content of the FGb package. So I changed my commands in .mapleinit as following:

libname:= “Macintosh HD/Users/jinhuili/12627/FGblib”/FGblib, libname:

mv <12627>/*.so <Macintosh HD/Users/jinhuili/12627/FGblib>

mv <12627>/FGblib <Macintosh HD/Users/jinhuili/12627/FGblib>

But still, no response in Maple when I type with(FGb). I wonder if what's written in the instruction is wrong, do you have another way to install it?