我的cmake ..能够同时找到Boost并且找不到Boost。这怎么可能？如何让它为第二个<==箭头输出找到Boost？
这是我为Caffe编译的cmake ..输出（看看<==箭头）：
Tams-MacBook-Pro:build tamtran$ cmake ..
-- The C compiler identification is AppleClang 8.1.0.8020042
-- The CXX compiler identification is AppleClang 8.1.0.8020042
-- Check for working C compiler: /Applications/Xcode833.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/cc
-- Check for working C compiler: /Applications/Xcode833.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/cc -- works
-- Detecting C compiler ABI info
-- Detecting C compiler ABI info - done
-- Detecting C compile features
-- Detecting C compile features - done
-- Check for working CXX compiler: /Applications/Xcode833.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/c++
-- Check for working CXX compiler: /Applications/Xcode833.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/c++ -- works
-- Detecting CXX compiler ABI info
-- Detecting CXX compiler ABI info - done
-- Detecting CXX compile features
-- Detecting CXX compile features - done
-- Looking for pthread.h
-- Looking for pthread.h - found
-- Looking for pthread_create
-- Looking for pthread_create - found
-- Found Threads: TRUE
-- Boost version: 1.68.0 <<==========!!==LOOK HERE(1/2)==!!=====================
-- Found the following Boost libraries:
-- system
-- thread
-- filesystem
-- chrono
-- date_time
-- atomic
-- Found GFlags: /usr/local/include
-- Found gflags (include: /usr/local/include, library: /usr/local/lib/libgflags.dylib)
-- Found Glog: /usr/local/include
-- Found glog (include: /usr/local/include, library: /usr/local/lib/libglog.dylib)
-- Found Protobuf: /usr/local/lib/libprotobuf.dylib (found version "3.6.1")
-- Found PROTOBUF Compiler: /usr/local/bin/protoc
-- HDF5: Using hdf5 compiler wrapper to determine C configuration
-- HDF5: Using hdf5 compiler wrapper to determine CXX configuration
-- Found HDF5: /usr/local/Cellar/hdf5/1.10.4/lib/libhdf5_cpp.dylib;/usr/local/Cellar/hdf5/1.10.4/lib/libhdf5.dylib;/usr/local/opt/szip/lib/libsz.dylib;/usr/lib/libz.dylib;/usr/lib/libdl.dylib;/usr/lib/libm.dylib (found version "1.10.4") found components: HL
-- Found LMDB: /usr/local/include
-- Found lmdb (include: /usr/local/include, library: /usr/local/lib/liblmdb.dylib)
-- Found LevelDB: /usr/local/include
-- Found LevelDB (include: /usr/local/include, library: /usr/local/lib/libleveldb.dylib)
-- Found Snappy: /usr/local/include
-- Found Snappy (include: /usr/local/include, library: /usr/local/lib/libsnappy.dylib)
-- -- CUDA is disabled. Building without it...
-- OpenCV found (/usr/local/share/OpenCV)
-- Found vecLib: /System/Library/Frameworks/Accelerate.framework/Versions/Current/Frameworks/vecLib.framework/Versions/Current/Headers
-- Found vecLib as part of Accelerate.framework
-- Found PythonInterp: /usr/local/bin/python2.7 (found suitable version "2.7.15", minimum required is "2.7")
-- Found PythonLibs: /usr/lib/libpython2.7.dylib (found suitable version "2.7.10", minimum required is "2.7")
-- Found NumPy: /usr/local/lib/python2.7/site-packages/numpy/core/include (found suitable version "1.15.4", minimum required is "1.7.1")
-- NumPy ver. 1.15.4 found (include: /usr/local/lib/python2.7/site-packages/numpy/core/include)
-- Could NOT find Boost <<==========!!==LOOK HERE(2/2)==!!===================
-- Could NOT find Doxygen (missing: DOXYGEN_EXECUTABLE)
-- Python interface is disabled or not all required dependencies found. Building without it...
-- Found Git: /usr/local/bin/git (found version "2.10.1")
--
-- ******************* Caffe Configuration Summary *******************
-- General:
-- Version : 1.0.0
-- Git : 1.0-132-g99bd997-dirty
-- System : Darwin
-- C++ compiler : /Applications/Xcode833.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/c++
-- Release CXX flags : -O3 -DNDEBUG -std=c++11 -fPIC -Wall
-- Debug CXX flags : -g -std=c++11 -fPIC -Wall
-- Build type : Release
--
-- BUILD_SHARED_LIBS : ON
-- BUILD_python : ON
-- BUILD_matlab : OFF
-- BUILD_docs : ON
-- CPU_ONLY : ON
-- USE_OPENCV : ON
-- USE_LEVELDB : ON
-- USE_LMDB : ON
-- USE_NCCL : OFF
-- ALLOW_LMDB_NOLOCK : OFF
-- USE_HDF5 : ON
--
-- Dependencies:
-- BLAS : Yes (vecLib)
-- Boost : Yes (ver. 1.68)
-- glog : Yes
-- gflags : Yes
-- protobuf : Yes (ver. 3.6.1)
-- lmdb : Yes (ver. 0.9.22)
-- LevelDB : Yes (ver. 1.20)
-- Snappy : Yes (ver. 1.1.7)
-- OpenCV : Yes (ver. 3.2.0)
-- CUDA : No
--
-- Documentaion:
-- Doxygen : No
-- config_file :
--
-- Install:
-- Install path : /Users/tamtran/InstalledStuff/caffe/build/install
--
-- Configuring done
CMake Error at CMakeLists.txt:107 (add_dependencies):
The dependency target "pycaffe" of target "pytest" does not exist.
-- Generating done
-- Build files have been written to: /Users/tamtran/InstalledStuff/caffe/build
额外的问题：为什么python没有被列为Boost库的一部分，尽管我也安装了boost-python？ boost和boost-python都是通过brew安装的。
如果你查看Caffe's CMake scripts，你会发现第二个Boost日志是在搜索Boost-Python时产生的，你可能会错过它。
编辑：至于为什么可能找不到Boost-Python：一种可能性是你为python3而不是python2.7安装了Boost-Python。