我正在尝试在我的Mac（OSX 10.12.1）上安装xgboost，按照这里的指南进行，但是遇到了一些问题。
步骤1
通过
brew install gcc --without-multilib获取带有openmp支持的gcc-6.x.x
终端
Ben$ brew install gcc --without-multilib
Error: gcc-5.3.0 already installed
To install this version, first `brew unlink gcc`
Ben$ brew unlink gcc
Unlinking /usr/local/Cellar/gcc/5.3.0... 1288 symlinks removed
Ben$ brew install gcc --without-multilib
[26 minutes later]
==> Summary
/usr/local/Cellar/gcc/6.2.0: 1,358 files, 238.3M, built in 26 minutes 20 seconds
步骤2
克隆存储库
git clone --recursive https://github.com/dmlc/xgboost
终端
Ben$ git clone --recursive https://github.com/dmlc/xgboost
Cloning into 'xgboost'...
remote: Counting objects: 18754, done.
remote: Compressing objects: 100% (21/21), done.
remote: Total 18754 (delta 1), reused 0 (delta 0), pack-reused 18733
Receiving objects: 100% (18754/18754), 6.23 MiB | 3.74 MiB/s, done.
Resolving deltas: 100% (11347/11347), done.
Checking connectivity... done.
Submodule 'dmlc-core' (https://github.com/dmlc/dmlc-core) registered for path 'dmlc-core'
Submodule 'rabit' (https://github.com/dmlc/rabit) registered for path 'rabit'
Cloning into '/Users/Ben/xgboost/dmlc-core'...
Cloning into '/Users/Ben/xgboost/rabit'...
Submodule path 'dmlc-core': checked out 'f35f14f30835af238257b979cc1fac3e41ff3291'
Submodule path 'rabit': checked out 'a9a2a69dc1144180a43f7d2d1097264482be7817'
第三步
使用以下命令进行构建：
cd xgboost; cp make/config.mk ./config.mk; make -j4注意：如果您使用OSX El Capitan，则brew会安装最新版本的gcc-6。因此，您可能需要修改Makefile＃L46并将gcc-5更改为gcc-6。之后，在make/config.mk中将gcc-5/g++-5更改为gcc-6/g++-6，然后使用以下命令进行构建。
嗯，我不太确定该怎么做。我在xgboost/内看到一个名为“Makefile”的文件。里面有很多我不理解的东西，但是这些行看起来很相关：
Makefile（片段）
# on Mac OS X, force brew gcc-6, since the Xcode c++ fails anyway
# it is useful for pip install compiling-on-the-fly
OS := $(shell uname)
ifeq ($(OS), Darwin)
export CC = $(if $(shell which gcc-6),gcc-6,$(if $(shell which gcc-mp-6), gcc-mp-6, clang))
export CXX = $(if $(shell which g++-6),g++-6,$(if $(shell which g++-mp-6),g++-mp-6, clang++))
endif
Going to ignore this and move on...
Terminal
Ben$ cd xgboost; cp make/config.mk ./config.mk; make -j4
[Tons of log output. Appears to finish succesfully]
...
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
步骤4（指令在这里）
如果您想使用最新的xgboost版本并且已经编译了xgboost，请使用
library(devtools); install('xgboost/R-package')手动安装xgboost包（根据您编译xgboost的位置更改路径）。
新的R会话
library(devtools)
install("/Users/Ben/xgboost/R-package")
Installing xgboost
'/Library/Frameworks/R.framework/Resources/bin/R' --no-site-file --no-environ --no-save --no-restore --quiet CMD INSTALL \
'/Users/Ben/xgboost/R-package' --library='/Library/Frameworks/R.framework/Versions/3.3/Resources/library' --install-tests
* installing *source* package ‘xgboost’ ...
** libs
g++-5 -std=c++11 -I/Library/Frameworks/R.framework/Resources/include -DNDEBUG -I../..//include -I../..//dmlc-core/include -I../..//rabit/include -I../../ -DXGBOOST_STRICT_R_MODE=1 -DDMLC_LOG_BEFORE_THROW=0 -DDMLC_ENABLE_STD_THREAD=1 -DDMLC_DISABLE_STDIN=1 -DDMLC_LOG_CUSTOMIZE=1 -DXGBOOST_CUSTOMIZE_LOGGER=1 -DRABIT_CUSTOMIZE_MSG_ -DRABIT_STRICT_CXX98_ -I/usr/local/opt/llvm/include -fopenmp -fPIC -Wall -mtune=core2 -g -O2 -c xgboost_R.cc -o xgboost_R.o
make: g++-5: No such file or directory
make: *** [xgboost_R.o] Error 1
ERROR: compilation failed for package ‘xgboost’
* removing ‘/Library/Frameworks/R.framework/Versions/3.3/Resources/library/xgboost’
* restoring previous ‘/Library/Frameworks/R.framework/Versions/3.3/Resources/library/xgboost’
Error: Command failed (1)
失败 :( 我做错了什么？
CPICFLAGS=-fPIC、CXXPICFLAGS=-fPIC和CXX1PICFLAGS=-fPIC。 - Valentin