Having trouble installing rails on mac and wondering if someone could help me:
dannys-mbp-2:~ Danny1$ sudo gem install rails Building native extensions. This could take a while... ERROR: Error installing rails: ERROR: Failed to build gem native extension.
/System/Library/Frameworks/Ruby.framework/Versions/2.0/usr/bin/ruby extconf.rb checking for libkern/OSAtomic.h... yes creating Makefile make "DESTDIR=" clean
make
"DESTDIR=" compiling atomic_reference.c atomic_reference.c:57:59: warning: incompatible pointer types passing 'void **' to parameter of type 'volatile int64_t *' (aka 'volatile long long *') [-Wincompatible-pointer-types] if (OSAtomicCompareAndSwap64(expect_value, new_value, &DATA_PTR(self))) { ^~~~~~~~~~~~~~~ /usr/include/libkern/OSAtomic.h:507:93: note: passing argument to parameter '__theValue' here bool OSAtomicCompareAndSwap64( int64_t __oldValue, int64_t __newValue, volatile int64_t *__theValue ); ^ 1 warning generated. linking shared-object atomic_reference.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: *** [atomic_reference.bundle] Error 1 make failed, exit code 2 Gem files will remain installed in /Library/Ruby/Gems/2.0.0/gems/atomic-1.1.16 for inspection. Results logged to /Library/Ruby/Gems/2.0.0/extensions/universal-darwin-13/2.0.0/atomic-1.1.16/gem_make.out 
