85b7463 change def of reducer to take function ptr
fe6366e add engine base
a98720e more deps
git-subtree-dir: subtree/rabit
git-subtree-split: 85b746394e0bed36a22ebb12beb8672616b39047
1db6449 remove include in -I, make things easier to direct compile
git-subtree-dir: subtree/rabit
git-subtree-split: 1db6449b019902e99de446c84aa36e73c03eb888