Git pull refusing to merge unrelated histories

Add --allow-unrelated-histories to solve the Git fatal error – “refusing to merge unrelated histories”

$ git pull origin master
From https://github.com/mkyong/java-concurrency
 * branch            master     -> FETCH_HEAD
fatal: refusing to merge unrelated histories

To fix it :

$ git pull origin master --allow-unrelated-histories
From https://github.com/mkyong/java-concurrency
 * branch            master     -> FETCH_HEAD
Merge made by the 'recursive' strategy.
 LICENSE | 674 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 674 insertions(+)
 create mode 100644 LICENSE

References

1. git-merge documentation –allow-unrelated-histories