Dear Chella,
When asking for help with a problem you need to give more information about what you did. Your email does not say how you tried to install gsl. Did you try to install from source? From a binary package? What version of CentOS? (7, 8, 9?) What version of gsl? And what command did you type to do the installation. Note that CentOS comes with gsl in the "EPEL" repositories (although CentOS7 ships with an oldish one), so you do something like: sudo yum update sudo yum install epel-release sudo yum install gsl gsl-devel If I could make a guess from your mention of a "lib-apt" package, I would say that your approach to installing might have been that you mistakenly tried to put a debian/ubuntu package onto a CentOS system, which will not work. But that's just guesswork: I would really need the answer to the questions above. Feel free to send me the information I asked for (privately so we don't burden the list with details).
