thanks for the reply
yes I could do that earlier but the install guide there in the package is not detailed like the one on the website, for example, does not show dependcies and what should be installed and what version, etc
although I could do install Xyce 6.12 serial and test it with the same guide but I did not install all the dependencies mentioned in the current building guide (some of them was enough)
also I found that bison should be version 3.4 or less (I think until 3.2 but not sure) and the newest version of bison 3.5 was not acceptable
finally the Xyce_regression 6.12 package does not come with the suggestXyceTagList.sh script so I used the one from Xyce _regression 7.3 and it worked