Numenta Build Fail using clang++

Pohsuans-MacBook-Pro:scripts pohsuanhuang$ CXX='usr/bin/clang++'
Pohsuans-MacBook-Pro:scripts pohsuanhuang$ echo $CXX
usr/bin/clang++
Pohsuans-MacBook-Pro:scripts pohsuanhuang$ CXX='usr/bin/clang++' make -j3
[  0%] Performing configure step for 'Apr1StaticLib'
[  0%] Performing configure step for 'CapnProto'
[  3%] Built target Swig
[  3%] Performing configure step for 'YamlStaticLib'
-- The CXX compiler identification is unknown
-- Check for working CXX compiler: /Users/pohsuanhuang/miniconda/envs/nupic/bin/c++
-- Check for working CXX compiler: /Users/pohsuanhuang/miniconda/envs/nupic/bin/c++ -- broken
CMake Error at /opt/local/share/cmake-3.3/Modules/CMakeTestCXXCompiler.cmake:54 (message):
  The C++ compiler "/Users/pohsuanhuang/miniconda/envs/nupic/bin/c++" is not
  able to compile a simple test program.

  It fails with the following output:

   Change Dir: /Users/pohsuanhuang/miniconda/envs/nupic/project/nupic.core/build/scripts/ThirdParty/Build/CapnProto/CMakeFiles/CMakeTmp



  Run Build Command:"/usr/bin/make" "cmTC_15f6a/fast"

  /Applications/Xcode.app/Contents/Developer/usr/bin/make -f
  CMakeFiles/cmTC_15f6a.dir/build.make CMakeFiles/cmTC_15f6a.dir/build

  Building CXX object CMakeFiles/cmTC_15f6a.dir/testCXXCompiler.cxx.o

  /Users/pohsuanhuang/miniconda/envs/nupic/bin/c++ -static-libgcc
  -fdiagnostics-show-option -m64 -fPIC -Wno-unused-variable
  -Wno-unused-parameter -Wno-incompatible-pointer-types
  -Wno-deprecated-declarations -stdlib=libc++ -static-libstdc++ -std=c++11
  -DHAVE_UNISTD_H -o CMakeFiles/cmTC_15f6a.dir/testCXXCompiler.cxx.o -c
  /Users/pohsuanhuang/miniconda/envs/nupic/project/nupic.core/build/scripts/ThirdParty/Build/CapnProto/CMakeFiles/CMakeTmp/testCXXCompiler.cxx


  c++: error: unrecognized command line option ‘-stdlib=libc++’

  make[4]: *** [CMakeFiles/cmTC_15f6a.dir/testCXXCompiler.cxx.o] Error 1

  make[3]: *** [cmTC_15f6a/fast] Error 2





  CMake will not be able to correctly generate this project.
Call Stack (most recent call first):
  CMakeLists.txt:1 (project)


-- Configuring incomplete, errors occurred!
See also "/Users/pohsuanhuang/miniconda/envs/nupic/project/nupic.core/build/scripts/ThirdParty/Build/CapnProto/CMakeFiles/CMakeOutput.log".
See also "/Users/pohsuanhuang/miniconda/envs/nupic/project/nupic.core/build/scripts/ThirdParty/Build/CapnProto/CMakeFiles/CMakeError.log".
make[2]: *** [ThirdParty/Stamp/CapnProto/CapnProto-configure] Error 1
make[1]: *** [external/CMakeFiles/CapnProto.dir/all] Error 2
make[1]: *** Waiting for unfinished jobs....
-- The C compiler identification is unknown
-- Check for working C compiler: /Users/pohsuanhuang/miniconda/envs/nupic/bin/cc
-- Check for working C compiler: /Users/pohsuanhuang/miniconda/envs/nupic/bin/cc -- broken
CMake Error at /opt/local/share/cmake-3.3/Modules/CMakeTestCCompiler.cmake:61 (message):
  The C compiler "/Users/pohsuanhuang/miniconda/envs/nupic/bin/cc" is not
  able to compile a simple test program.

  It fails with the following output:

   Change Dir: /Users/pohsuanhuang/miniconda/envs/nupic/project/nupic.core/build/scripts/ThirdParty/Build/YamlStaticLib/CMakeFiles/CMakeTmp



  Run Build Command:"/usr/bin/make" "cmTC_dbf9b/fast"

  /Applications/Xcode.app/Contents/Developer/usr/bin/make -f
  CMakeFiles/cmTC_dbf9b.dir/build.make CMakeFiles/cmTC_dbf9b.dir/build

  Building C object CMakeFiles/cmTC_dbf9b.dir/testCCompiler.c.o

  /Users/pohsuanhuang/miniconda/envs/nupic/bin/cc -static-libgcc
  -fdiagnostics-show-option -m64 -fPIC -Wno-unused-variable
  -Wno-unused-parameter -Wno-incompatible-pointer-types
  -Wno-deprecated-declarations -pipe -O2 -mtune=generic -fuse-ld=gold
  -fuse-linker-plugin -flto-report -flto -DHAVE_UNISTD_H -o
  CMakeFiles/cmTC_dbf9b.dir/testCCompiler.c.o -c
  /Users/pohsuanhuang/miniconda/envs/nupic/project/nupic.core/build/scripts/ThirdParty/Build/YamlStaticLib/CMakeFiles/CMakeTmp/testCCompiler.c


  cc1: error: LTO support has not been enabled in this configuration

  cc1: warning: unrecognized command line option
  "-Wno-incompatible-pointer-types" [enabled by default]

  make[4]: *** [CMakeFiles/cmTC_dbf9b.dir/testCCompiler.c.o] Error 1

  make[3]: *** [cmTC_dbf9b/fast] Error 2





  CMake will not be able to correctly generate this project.
Call Stack (most recent call first):
  CMakeLists.txt:4 (project)


-- Configuring incomplete, errors occurred!
See also "/Users/pohsuanhuang/miniconda/envs/nupic/project/nupic.core/build/scripts/ThirdParty/Build/YamlStaticLib/CMakeFiles/CMakeOutput.log".
See also "/Users/pohsuanhuang/miniconda/envs/nupic/project/nupic.core/build/scripts/ThirdParty/Build/YamlStaticLib/CMakeFiles/CMakeError.log".
make[2]: *** [ThirdParty/Stamp/YamlStaticLib/YamlStaticLib-configure] Error 1
make[1]: *** [external/CMakeFiles/YamlStaticLib.dir/all] Error 2
checking build system type... x86_64-apple-darwin15.3.0
checking host system type... x86_64-apple-darwin15.3.0
checking target system type... x86_64-apple-darwin15.3.0
Configuring APR library
Platform: x86_64-apple-darwin15.3.0
checking for working mkdir -p... yes
APR Version: 1.5.2
checking for chosen layout... apr
checking for gcc... gcc
checking whether the C compiler works... no
configure: error: in `/Users/pohsuanhuang/miniconda/envs/nupic/project/nupic.core/build/scripts/ThirdParty/Build/Apr1StaticLib':
configure: error: C compiler cannot create executables
See `config.log' for more details
make[2]: *** [ThirdParty/Stamp/Apr1StaticLib/Apr1StaticLib-configure] Error 77
make[1]: *** [external/CMakeFiles/Apr1StaticLib.dir/all] Error 2
make: *** [all] Error 2