I think you have a problem of syntax are you sure you are using `(backquote) around the pkg-config command. It looks to me that you are using ’ (quote) instead. In one case (quote) it will try to generate a string to pass to as one argument in the other case it will replace the command by its output.
Also you can test that the installation of GLFW is successful using pkg-config --modversion libglfw. If there is no issue reported then you are using the wrong quote.
Thank you very much Olivier…yes indeed it was my syntax error…when I changed to using the backquote instead of quote the program compiled just fine…thanks again for pointing that out. hmmm…LOL…I probably have a few projects on hold because I didn’t notice the difference between backquote and quote.