compilation errors on MacOS

from a mail sent to us:

I encounter a problem when trying to install Xerus on my macbook with clang++. When I typed ‘make install -j4’, I got the error message as in the attached screenshot.

I have installed all the libraries as stated in Xerus’ documentation. Is there something else that I missed? I hope you would help me with resolving this issue. Also attached is the config file that I used.

In addition, some info about my macbook:
- macOS High Sierra
- Apple LLVM version 9.0.0 (clang-900.0.38)

Thank you very much for your time!

In the attached screenshot there is an error in simplenumerics.cpp line 64: an ambiguous call to misc::pow.