Używam świeżej instalacji OSX 10.9 Mavericks i XCode 5.0.1. Kiedy próbuję uruchomić pakiet instalacyjny w moim projekcie, nie udaje mu się zainstalować gem libv8. Oto wyjście:

ERROR:  Error installing libv8:
        ERROR: Failed to build gem native extension.

        /Users/user1/.rvm/rubies/ruby-1.9.3-p448/bin/ruby extconf.rb
    creating Makefile
    Configured with: --prefix=/Applications/Xcode.app/Contents/Developer/usr --with-gxx-include-dir=/usr/include/c++/4.2.1
    Unable to find a compiler officially supported by v8.
    It is recommended to use GCC v4.4 or higher
    Using compiler: g++
    /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/libtool: file: /Users/user1/.rvm/gems/ruby-1.9.3-p448/gems/libv8-3.11.8.3/vendor/v8/out/x64.release/obj.target/preparser_lib/src/atomicops_internals_x86_gcc.o has no symbols
    In file included from ../src/accessors.cc:28:
    In file included from ../src/v8.h:60:
    In file included from ../src/objects-inl.h:38:
    In file included from ../src/elements.h:33:
    In file included from ../src/heap.h:41:
    ../src/store-buffer.h:229:9: error: private field 'heap_' is not used [-Werror,-Wunused-private-field]
      Heap* heap_;
            ^
    1 error generated.
    make[1]: *** [/Users/user1/.rvm/gems/ruby-1.9.3-p448/gems/libv8-3.11.8.3/vendor/v8/out/x64.release/obj.target/v8_base/src/accessors.o] Error 1
    make: *** [x64.release] Error 2
    GYP_GENERATORS=make \
        build/gyp/gyp --generator-output="out" build/all.gyp \
                      -Ibuild/standalone.gypi --depth=. \
                      -Dv8_target_arch=x64 \
                      -S.x64 -Dhost_arch=x64
      CXX(target) /Users/user1/.rvm/gems/ruby-1.9.3-p448/gems/libv8-3.11.8.3/vendor/v8/out/x64.release/obj.target/preparser_lib/src/allocation.o
      CXX(target) /Users/user1/.rvm/gems/ruby-1.9.3-p448/gems/libv8-3.11.8.3/vendor/v8/out/x64.release/obj.target/preparser_lib/src/atomicops_internals_x86_gcc.o
      CXX(target) /Users/user1/.rvm/gems/ruby-1.9.3-p448/gems/libv8-3.11.8.3/vendor/v8/out/x64.release/obj.target/preparser_lib/src/bignum.o
      CXX(target) /Users/user1/.rvm/gems/ruby-1.9.3-p448/gems/libv8-3.11.8.3/vendor/v8/out/x64.release/obj.target/preparser_lib/src/bignum-dtoa.o
      CXX(target) /Users/user1/.rvm/gems/ruby-1.9.3-p448/gems/libv8-3.11.8.3/vendor/v8/out/x64.release/obj.target/preparser_lib/src/cached-powers.o
      CXX(target) /Users/user1/.rvm/gems/ruby-1.9.3-p448/gems/libv8-3.11.8.3/vendor/v8/out/x64.release/obj.target/preparser_lib/src/conversions.o
      CXX(target) /Users/user1/.rvm/gems/ruby-1.9.3-p448/gems/libv8-3.11.8.3/vendor/v8/out/x64.release/obj.target/preparser_lib/src/diy-fp.o
      CXX(target) /Users/user1/.rvm/gems/ruby-1.9.3-p448/gems/libv8-3.11.8.3/vendor/v8/out/x64.release/obj.target/preparser_lib/src/dtoa.o
      CXX(target) /Users/user1/.rvm/gems/ruby-1.9.3-p448/gems/libv8-3.11.8.3/vendor/v8/out/x64.release/obj.target/preparser_lib/src/fast-dtoa.o
      CXX(target) /Users/user1/.rvm/gems/ruby-1.9.3-p448/gems/libv8-3.11.8.3/vendor/v8/out/x64.release/obj.target/preparser_lib/src/fixed-dtoa.o
      CXX(target) /Users/user1/.rvm/gems/ruby-1.9.3-p448/gems/libv8-3.11.8.3/vendor/v8/out/x64.release/obj.target/preparser_lib/src/once.o
      CXX(target) /Users/user1/.rvm/gems/ruby-1.9.3-p448/gems/libv8-3.11.8.3/vendor/v8/out/x64.release/obj.target/preparser_lib/src/preparse-data.o
      CXX(target) /Users/user1/.rvm/gems/ruby-1.9.3-p448/gems/libv8-3.11.8.3/vendor/v8/out/x64.release/obj.target/preparser_lib/src/preparser.o
      CXX(target) /Users/user1/.rvm/gems/ruby-1.9.3-p448/gems/libv8-3.11.8.3/vendor/v8/out/x64.release/obj.target/preparser_lib/src/preparser-api.o
      CXX(target) /Users/user1/.rvm/gems/ruby-1.9.3-p448/gems/libv8-3.11.8.3/vendor/v8/out/x64.release/obj.target/preparser_lib/src/scanner.o
      CXX(target) /Users/user1/.rvm/gems/ruby-1.9.3-p448/gems/libv8-3.11.8.3/vendor/v8/out/x64.release/obj.target/preparser_lib/src/strtod.o
      CXX(target) /Users/user1/.rvm/gems/ruby-1.9.3-p448/gems/libv8-3.11.8.3/vendor/v8/out/x64.release/obj.target/preparser_lib/src/token.o
      CXX(target) /Users/user1/.rvm/gems/ruby-1.9.3-p448/gems/libv8-3.11.8.3/vendor/v8/out/x64.release/obj.target/preparser_lib/src/unicode.o
      CXX(target) /Users/user1/.rvm/gems/ruby-1.9.3-p448/gems/libv8-3.11.8.3/vendor/v8/out/x64.release/obj.target/preparser_lib/src/utils.o
      LIBTOOL-STATIC /Users/user1/.rvm/gems/ruby-1.9.3-p448/gems/libv8-3.11.8.3/vendor/v8/out/x64.release/libpreparser_lib.a
      CXX(target) /Users/user1/.rvm/gems/ruby-1.9.3-p448/gems/libv8-3.11.8.3/vendor/v8/out/x64.release/obj.target/preparser/preparser/preparser-process.o
      LINK(target) /Users/user1/.rvm/gems/ruby-1.9.3-p448/gems/libv8-3.11.8.3/vendor/v8/out/x64.release/preparser
      CXX(target) /Users/user1/.rvm/gems/ruby-1.9.3-p448/gems/libv8-3.11.8.3/vendor/v8/out/x64.release/obj.target/v8_base/src/accessors.o


    Gem files will remain installed in /Users/user1/.rvm/gems/ruby-1.9.3-p448/gems/libv8-3.11.8.3 for inspection.
    Results logged to /Users/user1/.rvm/gems/ruby-1.9.3-p448/gems/libv8-3.11.8.3/ext/libv8/gem_make.out

Również podczas robienia

gcc -v

Otrzymuję

Configured with: --prefix=/Applications/Xcode.app/Contents/Developer/usr --with-gxx-include-dir=/usr/include/c++/4.2.1
Apple LLVM version 5.0 (clang-500.2.79) (based on LLVM 3.3svn)
Target: x86_64-apple-darwin13.0.0
Thread model: posix

Próbowałem zainstalować gcc przez homebrew, ale to nie pomaga. Jakie są inne możliwe rozwiązania?