Cannot compile cpp-netlib with boost/config.h missing #874

-- The C compiler identification is AppleClang 10.0.1.10010046
-- The CXX compiler identification is AppleClang 10.0.1.10010046
-- Check for working C compiler: /Library/Developer/CommandLineTools/usr/bin/cc
-- Check for working C compiler: /Library/Developer/CommandLineTools/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: /Library/Developer/CommandLineTools/usr/bin/c++
-- Check for working CXX compiler: /Library/Developer/CommandLineTools/usr/bin/c++ -- works
-- Detecting CXX compiler ABI info
-- Detecting CXX compiler ABI info - done
-- Detecting CXX compile features
-- Detecting CXX compile features - done
-- Found Boost 1.70.0 at /usr/local/boost-1.70.0/lib/cmake/Boost-1.70.0
--   Requested configuration: QUIET REQUIRED
-- Found boost_headers 1.70.0 at /usr/local/boost-1.70.0/lib/cmake/boost_headers-1.70.0
-- Boost 1.57.0 found.
-- Could NOT find OpenSSL, try to set the path to OpenSSL root folder in the system variable OPENSSL_ROOT_DIR (missing: OPENSSL_INCLUDE_DIR) 
-- Looking for pthread.h
-- Looking for pthread.h - found
-- Looking for pthread_create
-- Looking for pthread_create - found
-- Found Threads: TRUE  
-- Found PythonInterp: /usr/local/bin/python (found version "2.7.16") 
-- Configuring done
-- Generating done
-- Build files have been written to: /Users/grayfox/Downloads/cpp-netlib/build

/Applications/CMake.app/Contents/bin/cmake -H/Users/grayfox/Downloads/cpp-netlib -B/Users/grayfox/Downloads/cpp-netlib/build --check-build-system CMakeFiles/Makefile.cmake 0
/Applications/CMake.app/Contents/bin/cmake -E cmake_progress_start /Users/grayfox/Downloads/cpp-netlib/build/CMakeFiles /Users/grayfox/Downloads/cpp-netlib/build/CMakeFiles/progress.marks
/Library/Developer/CommandLineTools/usr/bin/make -f CMakeFiles/Makefile2 all
/Library/Developer/CommandLineTools/usr/bin/make -f libs/network/src/CMakeFiles/cppnetlib-client-connections.dir/build.make libs/network/src/CMakeFiles/cppnetlib-client-connections.dir/depend
cd /Users/grayfox/Downloads/cpp-netlib/build && /Applications/CMake.app/Contents/bin/cmake -E cmake_depends "Unix Makefiles" /Users/grayfox/Downloads/cpp-netlib /Users/grayfox/Downloads/cpp-netlib/libs/network/src /Users/grayfox/Downloads/cpp-netlib/build /Users/grayfox/Downloads/cpp-netlib/build/libs/network/src /Users/grayfox/Downloads/cpp-netlib/build/libs/network/src/CMakeFiles/cppnetlib-client-connections.dir/DependInfo.cmake --color=
Scanning dependencies of target cppnetlib-client-connections
/Library/Developer/CommandLineTools/usr/bin/make -f libs/network/src/CMakeFiles/cppnetlib-client-connections.dir/build.make libs/network/src/CMakeFiles/cppnetlib-client-connections.dir/build
[  1%] Building CXX object libs/network/src/CMakeFiles/cppnetlib-client-connections.dir/client.cpp.o
cd /Users/grayfox/Downloads/cpp-netlib/build/libs/network/src && /Library/Developer/CommandLineTools/usr/bin/c++  -DASIO_HEADER_ONLY -DBOOST_SPIRIT_THREADSAFE -DBOOST_TEST_DYN_LINK -I/Users/grayfox/Downloads/cpp-netlib/deps/asio/asio/include -I/Users/grayfox/Downloads/cpp-netlib  -Wall -ftemplate-depth=256 -std=c++11 -stdlib=libc++   -o CMakeFiles/cppnetlib-client-connections.dir/client.cpp.o -c /Users/grayfox/Downloads/cpp-netlib/libs/network/src/client.cpp
In file included from /Users/grayfox/Downloads/cpp-netlib/libs/network/src/client.cpp:13:
In file included from /Users/grayfox/Downloads/cpp-netlib/boost/network/protocol/http/client/connection/normal_delegate.ipp:12:
In file included from /Users/grayfox/Downloads/cpp-netlib/deps/asio/asio/include/asio/ip/tcp.hpp:18:
/Users/grayfox/Downloads/cpp-netlib/deps/asio/asio/include/asio/detail/config.hpp:26:11:  
fatal error: 'boost/config.hpp' file not found
# include <boost/config.hpp>
          ^~~~~~~~~~~~~~~~~~
1 error generated.
make[2]: *** [libs/network/src/CMakeFiles/cppnetlib-client-connections.dir/client.cpp.o] Error 1
make[1]: *** [libs/network/src/CMakeFiles/cppnetlib-client-connections.dir/all] Error 2
make: *** [all] Error 2