Dear All, I am trying to clone GiNaC repository with the command: git clone http://www.ginac.de/ginac.git and got the message: warning: remote HEAD refers to nonexistent ref, unable to checkout. What is wrong? Best wishes, Vladimir -- Vladimir V. Kisil email: kisilv at maths.leeds.ac.uk -- www: http://maths.leeds.ac.uk/~kisilv/