Development of gecode/yap takes place in: git@github.com:denys-duchier/yap-6.3.git which tracks the official yap repository and is also regularly pulled into it. see: https://github.com/denys-duchier/yap-6.3 Enquiries/bug reports can be made either on the yap mailing list or to the author denys.duchier /AT/ univ-orleans.fr. What litle documentation there is can be found in file DOC.txt.