Carsten Aulbert authored Apr 03, 2017 and Adam Mercer committed Apr 03, 2017

a recent update to libgsl in jessie-backports causes the backported
version to be preferred. revering the order of the libgsl dependencies
caused the default jessie version to be favoured.
Original: ddc8b4b930606ce4ef785da9278a309039e146b6