upstream

   [common]  Towards  the  original  author(s)  or  maintainer(s)  of  a
   project. Used in connection with software that is distributed both in
   its  original  source form and in derived, adapted versions through a
   distribution  (like  the  Debian  version  of Linux or one of the BSD
   ports) that has component maintainers for each of their parts. When a
   component maintainer receives a bug report or patch, he may choose to
   retain  the patch as a porting tweak to the distribution's derivative
   of  the  project, or to pass it upstream to the project's maintainer.
   The antonym downstream is rare.

[glossary]