Error When installing MRtrix3 on MacOS (pls help)

I installed Xcode and followed the steps online to install MRtrix3. Everything worked out pretty ok until the MRtrix3 Build section where the ./configure command on my bash shell gave me an error message announcing that no suitable compiler was found. How can I make this work so I can go on to build MRtrix3?

configure.log file:

MRtrix build type requested: release version

REPORT: WARNING: Anaconda removed from PATH to avoid conflicts

REPORT: Detecting OS: darwin
CMD: sw_vers -productVersion

REPORT: OS X deployment target: 10.14

REPORT: Looking for compiler [x86_64-apple-darwin13.4.0-clang++]:
CMD: x86_64-apple-darwin13.4.0-clang++ --version
error invoking command "x86_64-apple-darwin13.4.0-clang++": No such file or directory: 'x86_64-apple-darwin13.4.0-clang++'

REPORT: not found

ERROR: no suitable compiler found!

  Set the CXX environment variable to inform 'configure' of the path to the
  compiler on your system, as follows:
    $ export CXX=/usr/bin/g++-5.5
  (amend with the actual path to the compiler on your system)

  If you are using a compiler other than gcc or clang, you can also set the CXX_ARGS
  environment variable to specify how your compiler expects different arguments
  to be presented on the command line, for instance as follows:
    $ export CXX_ARGS="-c CFLAGS SRC -o OBJECT"
    $ ./configure

  See the file 'configure.log' for details. If this doesn't help and you need
  further assistance, please post on the MRtrix3 community forum
  (, and make sure to include the full contents of
  the 'configure.log' file.

This sounds like this issue – Anaconda again…

Basically, I think you need to unset the CXX & LD environment variables before running configure.