levenshtein won't install for slogger

gistfile1.txt

mba:tmp keith$ sudo gem install levenshtein
Building native extensions.  This could take a while...
ERROR:  Error installing levenshtein:
	ERROR: Failed to build gem native extension.

    /System/Library/Frameworks/Ruby.framework/Versions/2.0/usr/bin/ruby extconf.rb
checking for main() in -llevenshtein_array... no
checking for main() in -llevenshtein_array_of_strings... no
checking for main() in -llevenshtein_generic... no
checking for main() in -llevenshtein_string... no
creating Makefile

make "DESTDIR="
compiling levenshtein_fast.c
linking shared-object levenshtein/levenshtein_fast.bundle
clang: error: unknown argument: '-multiply_definedsuppress' [-Wunused-command-line-argument-hard-error-in-future]
clang: note: this will be a hard error (cannot be downgraded to a warning) in the future
make: *** [levenshtein_fast.bundle] Error 1


Gem files will remain installed in /Library/Ruby/Gems/2.0.0/gems/levenshtein-0.2.2 for inspection.
Results logged to /Library/Ruby/Gems/2.0.0/gems/levenshtein-0.2.2/ext/levenshtein/gem_make.out