大家用的比较多的是Linux和windows，基于Mac os的安装教程不多，
所以在安装的过程中遇到很多问题，经过较长时间的尝试，可以正常安装和使用，
【说在前面】由于新版本的Os操作系统不支持openMP，而官网给出的安装xgboost是给予Openmp的解决方案，
所以需要开启其功能，官方网站指定的是“brew install gcc --without-multilib”，但是实际安装中提示 gcc 6-2-0 installed，
然后进行后面的编译，会一直报错，无法进行安装，即使手动开启OpenMP的支持，
也就是采用的这个链接：https://www.v2ex.com/t/294579 也无法开启。
经过反复的思考和琢磨，问题应该是出在gcc上面~
所以后面的解决思路就指向，如何打开OpenMP功能，参考的连接如下：
http://www.zhihu.com/question/25739758
重点是这一句，重新安装gcc，
brew reinstall gcc --without-multilib
注意这里的reinstall而不是install，然后大约需要45分钟才能完整安装
然后安装官网给出的步骤，进行安装即可：
官网链接：https://xgboost.readthedocs.io/en/latest//build.html#building-on-osx
git clone --recursive https://github.com/dmlc/xgboost
cd xgboost;
cp make/minimum.mk ./config.mk;
make -j4
然后再按照如下的链接验证是否正确安装，就可以使用了
验证方法：http://www.cnblogs.com/chenhuan001/p/5595380.html
【备注】如果验证还是没有按照，可能系统存在差异，再加一步：
cd python-package/
python setup.py install
以上就可以正常使用。
【附加材料】
xbgoost的pip安装方法，未尝试：https://github.com/dmlc/xgboost/tree/master/python-package
关于xgboost的使用方法，参照链接：http://blog.csdn.net/zc02051126/article/details/46771793
安装中解决lib不存在的问题：http://stackoverflow.com/questions/36038836/install-xgboost-on-mac-ld-library-not-found
清楚已安装的xbgoost的方法 rm -rf /xbgoost
链接:http://www.cnblogs.com/Arlen/articles/1756636.html
【附加提示】正常按照会提示如下代码
g++-6 -std=c++0x -Wall -O3 -msse2 -Wno-unknown-pragmas -funroll-loops -Iinclude -Idmlc-core/include -Irabit/include -fPIC -fopenmp -MM -MT build/c_api/c_api.o src/c_api/c_api.cc >build/c_api/c_api.d g++-6 -std=c++0x -Wall -O3 -msse2 -Wno-unknown-pragmas -funroll-loops -Iinclude -Idmlc-core/include -Irabit/include -fPIC -fopenmp -MM -MT build/data/simple_dmatrix.o src/data/simple_dmatrix.cc >build/data/simple_dmatrix.d g++-6 -std=c++0x -Wall -O3 -msse2 -Wno-unknown-pragmas -funroll-loops -Iinclude -Idmlc-core/include -Irabit/include -fPIC -fopenmp -MM -MT build/data/sparse_page_dmatrix.o src/data/sparse_page_dmatrix.cc >build/data/sparse_page_dmatrix.d g++-6 -std=c++0x -Wall -O3 -msse2 -Wno-unknown-pragmas -funroll-loops -Iinclude -Idmlc-core/include -Irabit/include -fPIC -fopenmp -MM -MT build/data/sparse_page_raw_format.o src/data/sparse_page_raw_format.cc >build/data/sparse_page_raw_format.d g++-6 -c -std=c++0x -Wall -O3 -msse2 -Wno-unknown-pragmas -funroll-loops -Iinclude -Idmlc-core/include -Irabit/include -fPIC -fopenmp src/c_api/c_api.cc -o build/c_api/c_api.o g++-6 -c -std=c++0x -Wall -O3 -msse2 -Wno-unknown-pragmas -funroll-loops -Iinclude -Idmlc-core/include -Irabit/include -fPIC -fopenmp src/data/simple_dmatrix.cc -o build/data/simple_dmatrix.o g++-6 -c -std=c++0x -Wall -O3 -msse2 -Wno-unknown-pragmas -funroll-loops -Iinclude -Idmlc-core/include -Irabit/include -fPIC -fopenmp src/data/sparse_page_raw_format.cc -o build/data/sparse_page_raw_format.o g++-6 -c -std=c++0x -Wall -O3 -msse2 -Wno-unknown-pragmas -funroll-loops -Iinclude -Idmlc-core/include -Irabit/include -fPIC -fopenmp src/data/sparse_page_dmatrix.cc -o build/data/sparse_page_dmatrix.o g++-6 -std=c++0x -Wall -O3 -msse2 -Wno-unknown-pragmas -funroll-loops -Iinclude -Idmlc-core/include -Irabit/include -fPIC -fopenmp -MM -MT build/data/sparse_page_source.o src/data/sparse_page_source.cc >build/data/sparse_page_source.d g++-6 -c -std=c++0x -Wall -O3 -msse2 -Wno-unknown-pragmas -funroll-loops -Iinclude -Idmlc-core/include -Irabit/include -fPIC -fopenmp src/data/sparse_page_source.cc -o build/data/sparse_page_source.o g++-6 -std=c++0x -Wall -O3 -msse2 -Wno-unknown-pragmas -funroll-loops -Iinclude -Idmlc-core/include -Irabit/include -fPIC -fopenmp -MM -MT build/data/sparse_page_writer.o src/data/sparse_page_writer.cc >build/data/sparse_page_writer.d g++-6 -c -std=c++0x -Wall -O3 -msse2 -Wno-unknown-pragmas -funroll-loops -Iinclude -Idmlc-core/include -Irabit/include -fPIC -fopenmp src/data/sparse_page_writer.cc -o build/data/sparse_page_writer.o g++-6 -std=c++0x -Wall -O3 -msse2 -Wno-unknown-pragmas -funroll-loops -Iinclude -Idmlc-core/include -Irabit/include -fPIC -fopenmp -MM -MT build/gbm/gblinear.o src/gbm/gblinear.cc >build/gbm/gblinear.d g++-6 -c -std=c++0x -Wall -O3 -msse2 -Wno-unknown-pragmas -funroll-loops -Iinclude -Idmlc-core/include -Irabit/include -fPIC -fopenmp src/gbm/gblinear.cc -o build/gbm/gblinear.o g++-6 -std=c++0x -Wall -O3 -msse2 -Wno-unknown-pragmas -funroll-loops -Iinclude -Idmlc-core/include -Irabit/include -fPIC -fopenmp -MM -MT build/gbm/gbm.o src/gbm/gbm.cc >build/gbm/gbm.d g++-6 -c -std=c++0x -Wall -O3 -msse2 -Wno-unknown-pragmas -funroll-loops -Iinclude -Idmlc-core/include -Irabit/include -fPIC -fopenmp src/gbm/gbm.cc -o build/gbm/gbm.o g++-6 -std=c++0x -Wall -O3 -msse2 -Wno-unknown-pragmas -funroll-loops -Iinclude -Idmlc-core/include -Irabit/include -fPIC -fopenmp -MM -MT build/gbm/gbtree.o src/gbm/gbtree.cc >build/gbm/gbtree.d g++-6 -std=c++0x -Wall -O3 -msse2 -Wno-unknown-pragmas -funroll-loops -Iinclude -Idmlc-core/include -Irabit/include -fPIC -fopenmp -MM -MT build/metric/elementwise_metric.o src/metric/elementwise_metric.cc >build/metric/elementwise_metric.d g++-6 -c -std=c++0x -Wall -O3 -msse2 -Wno-unknown-pragmas -funroll-loops -Iinclude -Idmlc-core/include -Irabit/include -fPIC -fopenmp src/gbm/gbtree.cc -o build/gbm/gbtree.o g++-6 -c -std=c++0x -Wall -O3 -msse2 -Wno-unknown-pragmas -funroll-loops -Iinclude -Idmlc-core/include -Irabit/include -fPIC -fopenmp src/metric/elementwise_metric.cc -o build/metric/elementwise_metric.o g++-6 -std=c++0x -Wall -O3 -msse2 -Wno-unknown-pragmas -funroll-loops -Iinclude -Idmlc-core/include -Irabit/include -fPIC -fopenmp -MM -MT build/metric/metric.o src/metric/metric.cc >build/metric/metric.d g++-6 -c -std=c++0x -Wall -O3 -msse2 -Wno-unknown-pragmas -funroll-loops -Iinclude -Idmlc-core/include -Irabit/include -fPIC -fopenmp src/metric/metric.cc -o build/metric/metric.o g++-6 -std=c++0x -Wall -O3 -msse2 -Wno-unknown-pragmas -funroll-loops -Iinclude -Idmlc-core/include -Irabit/include -fPIC -fopenmp -MM -MT build/metric/multiclass_metric.o src/metric/multiclass_metric.cc >build/metric/multiclass_metric.d g++-6 -c -std=c++0x -Wall -O3 -msse2 -Wno-unknown-pragmas -funroll-loops -Iinclude -Idmlc-core/include -Irabit/include -fPIC -fopenmp src/metric/multiclass_metric.cc -o build/metric/multiclass_metric.o g++-6 -std=c++0x -Wall -O3 -msse2 -Wno-unknown-pragmas -funroll-loops -Iinclude -Idmlc-core/include -Irabit/include -fPIC -fopenmp -MM -MT build/metric/rank_metric.o src/metric/rank_metric.cc >build/metric/rank_metric.d g++-6 -c -std=c++0x -Wall -O3 -msse2 -Wno-unknown-pragmas -funroll-loops -Iinclude -Idmlc-core/include -Irabit/include -fPIC -fopenmp src/metric/rank_metric.cc -o build/metric/rank_metric.o g++-6 -std=c++0x -Wall -O3 -msse2 -Wno-unknown-pragmas -funroll-loops -Iinclude -Idmlc-core/include -Irabit/include -fPIC -fopenmp -MM -MT build/objective/multiclass_obj.o src/objective/multiclass_obj.cc >build/objective/multiclass_obj.d g++-6 -c -std=c++0x -Wall -O3 -msse2 -Wno-unknown-pragmas -funroll-loops -Iinclude -Idmlc-core/include -Irabit/include -fPIC -fopenmp src/objective/multiclass_obj.cc -o build/objective/multiclass_obj.o g++-6 -std=c++0x -Wall -O3 -msse2 -Wno-unknown-pragmas -funroll-loops -Iinclude -Idmlc-core/include -Irabit/include -fPIC -fopenmp -MM -MT build/objective/objective.o src/objective/objective.cc >build/objective/objective.d g++-6 -c -std=c++0x -Wall -O3 -msse2 -Wno-unknown-pragmas -funroll-loops -Iinclude -Idmlc-core/include -Irabit/include -fPIC -fopenmp src/objective/objective.cc -o build/objective/objective.o g++-6 -std=c++0x -Wall -O3 -msse2 -Wno-unknown-pragmas -funroll-loops -Iinclude -Idmlc-core/include -Irabit/include -fPIC -fopenmp -MM -MT build/objective/rank_obj.o src/objective/rank_obj.cc >build/objective/rank_obj.d g++-6 -c -std=c++0x -Wall -O3 -msse2 -Wno-unknown-pragmas -funroll-loops -Iinclude -Idmlc-core/include -Irabit/include -fPIC -fopenmp src/objective/rank_obj.cc -o build/objective/rank_obj.o g++-6 -std=c++0x -Wall -O3 -msse2 -Wno-unknown-pragmas -funroll-loops -Iinclude -Idmlc-core/include -Irabit/include -fPIC -fopenmp -MM -MT build/objective/regression_obj.o src/objective/regression_obj.cc >build/objective/regression_obj.d g++-6 -c -std=c++0x -Wall -O3 -msse2 -Wno-unknown-pragmas -funroll-loops -Iinclude -Idmlc-core/include -Irabit/include -fPIC -fopenmp src/objective/regression_obj.cc -o build/objective/regression_obj.o g++-6 -std=c++0x -Wall -O3 -msse2 -Wno-unknown-pragmas -funroll-loops -Iinclude -Idmlc-core/include -Irabit/include -fPIC -fopenmp -MM -MT build/tree/tree_model.o src/tree/tree_model.cc >build/tree/tree_model.d g++-6 -c -std=c++0x -Wall -O3 -msse2 -Wno-unknown-pragmas -funroll-loops -Iinclude -Idmlc-core/include -Irabit/include -fPIC -fopenmp src/tree/tree_model.cc -o build/tree/tree_model.o g++-6 -std=c++0x -Wall -O3 -msse2 -Wno-unknown-pragmas -funroll-loops -Iinclude -Idmlc-core/include -Irabit/include -fPIC -fopenmp -MM -MT build/tree/tree_updater.o src/tree/tree_updater.cc >build/tree/tree_updater.d g++-6 -c -std=c++0x -Wall -O3 -msse2 -Wno-unknown-pragmas -funroll-loops -Iinclude -Idmlc-core/include -Irabit/include -fPIC -fopenmp src/tree/tree_updater.cc -o build/tree/tree_updater.o g++-6 -std=c++0x -Wall -O3 -msse2 -Wno-unknown-pragmas -funroll-loops -Iinclude -Idmlc-core/include -Irabit/include -fPIC -fopenmp -MM -MT build/tree/updater_colmaker.o src/tree/updater_colmaker.cc >build/tree/updater_colmaker.d g++-6 -c -std=c++0x -Wall -O3 -msse2 -Wno-unknown-pragmas -funroll-loops -Iinclude -Idmlc-core/include -Irabit/include -fPIC -fopenmp src/tree/updater_colmaker.cc -o build/tree/updater_colmaker.o g++-6 -std=c++0x -Wall -O3 -msse2 -Wno-unknown-pragmas -funroll-loops -Iinclude -Idmlc-core/include -Irabit/include -fPIC -fopenmp -MM -MT build/tree/updater_histmaker.o src/tree/updater_histmaker.cc >build/tree/updater_histmaker.d g++-6 -c -std=c++0x -Wall -O3 -msse2 -Wno-unknown-pragmas -funroll-loops -Iinclude -Idmlc-core/include -Irabit/include -fPIC -fopenmp src/tree/updater_histmaker.cc -o build/tree/updater_histmaker.o g++-6 -std=c++0x -Wall -O3 -msse2 -Wno-unknown-pragmas -funroll-loops -Iinclude -Idmlc-core/include -Irabit/include -fPIC -fopenmp -MM -MT build/tree/updater_prune.o src/tree/updater_prune.cc >build/tree/updater_prune.d g++-6 -c -std=c++0x -Wall -O3 -msse2 -Wno-unknown-pragmas -funroll-loops -Iinclude -Idmlc-core/include -Irabit/include -fPIC -fopenmp src/tree/updater_prune.cc -o build/tree/updater_prune.o g++-6 -std=c++0x -Wall -O3 -msse2 -Wno-unknown-pragmas -funroll-loops -Iinclude -Idmlc-core/include -Irabit/include -fPIC -fopenmp -MM -MT build/tree/updater_refresh.o src/tree/updater_refresh.cc >build/tree/updater_refresh.d g++-6 -c -std=c++0x -Wall -O3 -msse2 -Wno-unknown-pragmas -funroll-loops -Iinclude -Idmlc-core/include -Irabit/include -fPIC -fopenmp src/tree/updater_refresh.cc -o build/tree/updater_refresh.o g++-6 -std=c++0x -Wall -O3 -msse2 -Wno-unknown-pragmas -funroll-loops -Iinclude -Idmlc-core/include -Irabit/include -fPIC -fopenmp -MM -MT build/tree/updater_skmaker.o src/tree/updater_skmaker.cc >build/tree/updater_skmaker.d g++-6 -c -std=c++0x -Wall -O3 -msse2 -Wno-unknown-pragmas -funroll-loops -Iinclude -Idmlc-core/include -Irabit/include -fPIC -fopenmp src/tree/updater_skmaker.cc -o build/tree/updater_skmaker.o g++-6 -std=c++0x -Wall -O3 -msse2 -Wno-unknown-pragmas -funroll-loops -Iinclude -Idmlc-core/include -Irabit/include -fPIC -fopenmp -MM -MT build/tree/updater_sync.o src/tree/updater_sync.cc >build/tree/updater_sync.d g++-6 -c -std=c++0x -Wall -O3 -msse2 -Wno-unknown-pragmas -funroll-loops -Iinclude -Idmlc-core/include -Irabit/include -fPIC -fopenmp src/tree/updater_sync.cc -o build/tree/updater_sync.o cd dmlc-core; /Library/Developer/CommandLineTools/usr/bin/make libdmlc.a config=/Users/zhuangzhen/xgboost/config.mk; cd /Users/zhuangzhen/xgboost g++-6 -c -O3 -Wall -msse2 -Wno-unknown-pragmas -Iinclude -std=c++0x -fopenmp -fPIC -DDMLC_USE_HDFS=0 -DDMLC_USE_S3=0 -DDMLC_USE_AZURE=0 -o line_split.o src/io/line_split.cc g++-6 -c -O3 -Wall -msse2 -Wno-unknown-pragmas -Iinclude -std=c++0x -fopenmp -fPIC -DDMLC_USE_HDFS=0 -DDMLC_USE_S3=0 -DDMLC_USE_AZURE=0 -o recordio_split.o src/io/recordio_split.cc cd rabit; /Library/Developer/CommandLineTools/usr/bin/make lib/librabit.a; cd /Users/zhuangzhen/xgboost g++-6 -c -O3 -msse2 -Wall -Wextra -Wno-unused-parameter -Wno-unknown-pragmas -std=c++0x -fPIC -o allreduce_base.o src/allreduce_base.cc g++-6 -c -O3 -Wall -msse2 -Wno-unknown-pragmas -Iinclude -std=c++0x -fopenmp -fPIC -DDMLC_USE_HDFS=0 -DDMLC_USE_S3=0 -DDMLC_USE_AZURE=0 -o input_split_base.o src/io/input_split_base.cc g++-6 -std=c++0x -Wall -O3 -msse2 -Wno-unknown-pragmas -funroll-loops -Iinclude -Idmlc-core/include -Irabit/include -fPIC -fopenmp -MM -MT build/cli_main.o src/cli_main.cc >build/cli_main.d g++-6 -c -std=c++0x -Wall -O3 -msse2 -Wno-unknown-pragmas -funroll-loops -Iinclude -Idmlc-core/include -Irabit/include -fPIC -fopenmp src/cli_main.cc -o build/cli_main.o g++-6 -c -O3 -msse2 -Wall -Wextra -Wno-unused-parameter -Wno-unknown-pragmas -std=c++0x -fPIC -o allreduce_robust.o src/allreduce_robust.cc g++-6 -c -O3 -Wall -msse2 -Wno-unknown-pragmas -Iinclude -std=c++0x -fopenmp -fPIC -DDMLC_USE_HDFS=0 -DDMLC_USE_S3=0 -DDMLC_USE_AZURE=0 -o io.o src/io.cc g++-6 -c -O3 -msse2 -Wall -Wextra -Wno-unused-parameter -Wno-unknown-pragmas -std=c++0x -fPIC -o engine.o src/engine.cc g++-6 -c -O3 -Wall -msse2 -Wno-unknown-pragmas -Iinclude -std=c++0x -fopenmp -fPIC -DDMLC_USE_HDFS=0 -DDMLC_USE_S3=0 -DDMLC_USE_AZURE=0 -o local_filesys.o src/io/local_filesys.cc g++-6 -c -O3 -msse2 -Wall -Wextra -Wno-unused-parameter -Wno-unknown-pragmas -std=c++0x -fPIC -o c_api.o src/c_api.cc g++-6 -c -O3 -Wall -msse2 -Wno-unknown-pragmas -Iinclude -std=c++0x -fopenmp -fPIC -DDMLC_USE_HDFS=0 -DDMLC_USE_S3=0 -DDMLC_USE_AZURE=0 -o data.o src/data.cc g++-6 -c -O3 -Wall -msse2 -Wno-unknown-pragmas -Iinclude -std=c++0x -fopenmp -fPIC -DDMLC_USE_HDFS=0 -DDMLC_USE_S3=0 -DDMLC_USE_AZURE=0 -o recordio.o src/recordio.cc g++-6 -c -O3 -Wall -msse2 -Wno-unknown-pragmas -Iinclude -std=c++0x -fopenmp -fPIC -DDMLC_USE_HDFS=0 -DDMLC_USE_S3=0 -DDMLC_USE_AZURE=0 -o config.o src/config.cc ar cr lib/librabit.a allreduce_base.o allreduce_robust.o engine.o c_api.o ar cr libdmlc.a line_split.o recordio_split.o input_split_base.o io.o local_filesys.o data.o recordio.o config.o ar crv lib/libxgboost.a build/learner.o build/logging.o build/c_api/c_api.o build/c_api/c_api_error.o build/common/common.o build/data/data.o build/data/simple_csr_source.o build/data/simple_dmatrix.o build/data/sparse_page_dmatrix.o build/data/sparse_page_raw_format.o build/data/sparse_page_source.o build/data/sparse_page_writer.o build/gbm/gblinear.o build/gbm/gbm.o build/gbm/gbtree.o build/metric/elementwise_metric.o build/metric/metric.o build/metric/multiclass_metric.o build/metric/rank_metric.o build/objective/multiclass_obj.o build/objective/objective.o build/objective/rank_obj.o build/objective/regression_obj.o build/tree/tree_model.o build/tree/tree_updater.o build/tree/updater_colmaker.o build/tree/updater_histmaker.o build/tree/updater_prune.o build/tree/updater_refresh.o build/tree/updater_skmaker.o build/tree/updater_sync.o a - build/learner.o g++-6 -std=c++0x -Wall -O3 -msse2 -Wno-unknown-pragmas -funroll-loops -Iinclude -Idmlc-core/include -Irabit/include -fPIC -fopenmp -shared -o lib/libxgboost.so build/learner.o build/logging.o build/c_api/c_api.o build/c_api/c_api_error.o build/common/common.o build/data/data.o build/data/simple_csr_source.o build/data/simple_dmatrix.o build/data/sparse_page_dmatrix.o build/data/sparse_page_raw_format.o build/data/sparse_page_source.o build/data/sparse_page_writer.o build/gbm/gblinear.o build/gbm/gbm.o build/gbm/gbtree.o build/metric/elementwise_metric.o build/metric/metric.o build/metric/multiclass_metric.o build/metric/rank_metric.o build/objective/multiclass_obj.o build/objective/objective.o build/objective/rank_obj.o build/objective/regression_obj.o build/tree/tree_model.o build/tree/tree_updater.o build/tree/updater_colmaker.o build/tree/updater_histmaker.o build/tree/updater_prune.o build/tree/updater_refresh.o build/tree/updater_skmaker.o build/tree/updater_sync.o dmlc-core/libdmlc.a rabit/lib/librabit.a -pthread -lm -fopenmp g++-6 -std=c++0x -Wall -O3 -msse2 -Wno-unknown-pragmas -funroll-loops -Iinclude -Idmlc-core/include -Irabit/include -fPIC -fopenmp -o xgboost build/cli_main.o build/learner.o build/logging.o build/c_api/c_api.o build/c_api/c_api_error.o build/common/common.o build/data/data.o build/data/simple_csr_source.o build/data/simple_dmatrix.o build/data/sparse_page_dmatrix.o build/data/sparse_page_raw_format.o build/data/sparse_page_source.o build/data/sparse_page_writer.o build/gbm/gblinear.o build/gbm/gbm.o build/gbm/gbtree.o build/metric/elementwise_metric.o build/metric/metric.o build/metric/multiclass_metric.o build/metric/rank_metric.o build/objective/multiclass_obj.o build/objective/objective.o build/objective/rank_obj.o build/objective/regression_obj.o build/tree/tree_model.o build/tree/tree_updater.o build/tree/updater_colmaker.o build/tree/updater_histmaker.o build/tree/updater_prune.o build/tree/updater_refresh.o build/tree/updater_skmaker.o build/tree/updater_sync.o dmlc-core/libdmlc.a rabit/lib/librabit.a -pthread -lm -fopenmp a - build/logging.o a - build/c_api/c_api.o a - build/c_api/c_api_error.o a - build/common/common.o a - build/data/data.o a - build/data/simple_csr_source.o a - build/data/simple_dmatrix.o a - build/data/sparse_page_dmatrix.o a - build/data/sparse_page_raw_format.o a - build/data/sparse_page_source.o a - build/data/sparse_page_writer.o a - build/gbm/gblinear.o a - build/gbm/gbm.o a - build/gbm/gbtree.o a - build/metric/elementwise_metric.o a - build/metric/metric.o a - build/metric/multiclass_metric.o a - build/metric/rank_metric.o a - build/objective/multiclass_obj.o a - build/objective/objective.o a - build/objective/rank_obj.o a - build/objective/regression_obj.o a - build/tree/tree_model.o a - build/tree/tree_updater.o a - build/tree/updater_colmaker.o a - build/tree/updater_histmaker.o a - build/tree/updater_prune.o a - build/tree/updater_refresh.o a - build/tree/updater_skmaker.o a - build/tree/updater_sync.o