therubyracer_libv8_error_on_osx10.11.4.log

$ gem install therubyracer                                 rbenv:2.2.4
Fetching: libv8-3.16.14.13.gem (100%)
Building native extensions.  This could take a while...
ERROR:  Error installing therubyracer:
	ERROR: Failed to build gem native extension.

    /Users/takuyan/.rbenv/versions/2.2.4/bin/ruby -r ./siteconf20160324-16905-11t0grf.rb extconf.rb
creating Makefile
Compiling v8 for x64
Using python 2.7.8
Using compiler: /usr/bin/c++ (clang version 7.3.0)
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/libtool: file: /Users/takuyan/.rbenv/versions/2.2.4/lib/ruby/gems/2.2.0/gems/libv8-3.16.14.13/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:32:
../src/objects.h:5252:44: error: shifting a negative signed value is undefined [-Werror,-Wshift-negative-value]
  static const int kElementsKindMask = (-1 << kElementsKindShift) &
                                        ~~ ^
../src/objects.h:7386:36: error: shifting a negative signed value is undefined [-Werror,-Wshift-negative-value]
      (~kMaxCachedArrayIndexLength << kArrayIndexHashLengthShift) |
       ~~~~~~~~~~~~~~~~~~~~~~~~~~~ ^
2 errors generated.
make[1]: *** [/Users/takuyan/.rbenv/versions/2.2.4/lib/ruby/gems/2.2.0/gems/libv8-3.16.14.13/vendor/v8/out/x64.release/obj.target/v8_base/src/accessors.o] Error 1
make: *** [x64.release] Error 2
/Users/takuyan/.rbenv/versions/2.2.4/lib/ruby/gems/2.2.0/gems/libv8-3.16.14.13/ext/libv8/location.rb:36:in `block in verify_installation!': libv8 did not install properly, expected binary v8 archive '/Users/takuyan/.rbenv/versions/2.2.4/lib/ruby/gems/2.2.0/gems/libv8-3.16.14.13/vendor/v8/out/x64.release/obj.target/tools/gyp/libv8_base.a'to exist, but it was not found (Libv8::Location::Vendor::ArchiveNotFound)
	from /Users/takuyan/.rbenv/versions/2.2.4/lib/ruby/gems/2.2.0/gems/libv8-3.16.14.13/ext/libv8/location.rb:35:in `each'
	from /Users/takuyan/.rbenv/versions/2.2.4/lib/ruby/gems/2.2.0/gems/libv8-3.16.14.13/ext/libv8/location.rb:35:in `verify_installation!'
	from /Users/takuyan/.rbenv/versions/2.2.4/lib/ruby/gems/2.2.0/gems/libv8-3.16.14.13/ext/libv8/location.rb:26:in `install!'
	from extconf.rb:7:in `<main>'
GYP_GENERATORS=make \
	build/gyp/gyp --generator-output="out" build/all.gyp \
	              -Ibuild/standalone.gypi --depth=. \
	              -Dv8_target_arch=x64 \
	              -S.x64  -Dv8_enable_backtrace=1 -Dv8_can_use_vfp2_instructions=true -Darm_fpu=vfpv2 -Dv8_can_use_vfp3_instructions=true -Darm_fpu=vfpv3 -Dwerror=''
  CXX(target) /Users/takuyan/.rbenv/versions/2.2.4/lib/ruby/gems/2.2.0/gems/libv8-3.16.14.13/vendor/v8/out/x64.release/obj.target/preparser_lib/src/allocation.o
  CXX(target) /Users/takuyan/.rbenv/versions/2.2.4/lib/ruby/gems/2.2.0/gems/libv8-3.16.14.13/vendor/v8/out/x64.release/obj.target/preparser_lib/src/atomicops_internals_x86_gcc.o
  CXX(target) /Users/takuyan/.rbenv/versions/2.2.4/lib/ruby/gems/2.2.0/gems/libv8-3.16.14.13/vendor/v8/out/x64.release/obj.target/preparser_lib/src/bignum.o
  CXX(target) /Users/takuyan/.rbenv/versions/2.2.4/lib/ruby/gems/2.2.0/gems/libv8-3.16.14.13/vendor/v8/out/x64.release/obj.target/preparser_lib/src/bignum-dtoa.o
  CXX(target) /Users/takuyan/.rbenv/versions/2.2.4/lib/ruby/gems/2.2.0/gems/libv8-3.16.14.13/vendor/v8/out/x64.release/obj.target/preparser_lib/src/cached-powers.o
  CXX(target) /Users/takuyan/.rbenv/versions/2.2.4/lib/ruby/gems/2.2.0/gems/libv8-3.16.14.13/vendor/v8/out/x64.release/obj.target/preparser_lib/src/conversions.o
  CXX(target) /Users/takuyan/.rbenv/versions/2.2.4/lib/ruby/gems/2.2.0/gems/libv8-3.16.14.13/vendor/v8/out/x64.release/obj.target/preparser_lib/src/diy-fp.o
  CXX(target) /Users/takuyan/.rbenv/versions/2.2.4/lib/ruby/gems/2.2.0/gems/libv8-3.16.14.13/vendor/v8/out/x64.release/obj.target/preparser_lib/src/dtoa.o
  CXX(target) /Users/takuyan/.rbenv/versions/2.2.4/lib/ruby/gems/2.2.0/gems/libv8-3.16.14.13/vendor/v8/out/x64.release/obj.target/preparser_lib/src/fast-dtoa.o
  CXX(target) /Users/takuyan/.rbenv/versions/2.2.4/lib/ruby/gems/2.2.0/gems/libv8-3.16.14.13/vendor/v8/out/x64.release/obj.target/preparser_lib/src/fixed-dtoa.o
  CXX(target) /Users/takuyan/.rbenv/versions/2.2.4/lib/ruby/gems/2.2.0/gems/libv8-3.16.14.13/vendor/v8/out/x64.release/obj.target/preparser_lib/src/once.o
  CXX(target) /Users/takuyan/.rbenv/versions/2.2.4/lib/ruby/gems/2.2.0/gems/libv8-3.16.14.13/vendor/v8/out/x64.release/obj.target/preparser_lib/src/preparse-data.o
  CXX(target) /Users/takuyan/.rbenv/versions/2.2.4/lib/ruby/gems/2.2.0/gems/libv8-3.16.14.13/vendor/v8/out/x64.release/obj.target/preparser_lib/src/preparser.o
  CXX(target) /Users/takuyan/.rbenv/versions/2.2.4/lib/ruby/gems/2.2.0/gems/libv8-3.16.14.13/vendor/v8/out/x64.release/obj.target/preparser_lib/src/preparser-api.o
  CXX(target) /Users/takuyan/.rbenv/versions/2.2.4/lib/ruby/gems/2.2.0/gems/libv8-3.16.14.13/vendor/v8/out/x64.release/obj.target/preparser_lib/src/scanner.o
  CXX(target) /Users/takuyan/.rbenv/versions/2.2.4/lib/ruby/gems/2.2.0/gems/libv8-3.16.14.13/vendor/v8/out/x64.release/obj.target/preparser_lib/src/strtod.o
  CXX(target) /Users/takuyan/.rbenv/versions/2.2.4/lib/ruby/gems/2.2.0/gems/libv8-3.16.14.13/vendor/v8/out/x64.release/obj.target/preparser_lib/src/token.o
  CXX(target) /Users/takuyan/.rbenv/versions/2.2.4/lib/ruby/gems/2.2.0/gems/libv8-3.16.14.13/vendor/v8/out/x64.release/obj.target/preparser_lib/src/unicode.o
  CXX(target) /Users/takuyan/.rbenv/versions/2.2.4/lib/ruby/gems/2.2.0/gems/libv8-3.16.14.13/vendor/v8/out/x64.release/obj.target/preparser_lib/src/utils.o
  LIBTOOL-STATIC /Users/takuyan/.rbenv/versions/2.2.4/lib/ruby/gems/2.2.0/gems/libv8-3.16.14.13/vendor/v8/out/x64.release/libpreparser_lib.a
  CXX(target) /Users/takuyan/.rbenv/versions/2.2.4/lib/ruby/gems/2.2.0/gems/libv8-3.16.14.13/vendor/v8/out/x64.release/obj.target/preparser/preparser/preparser-process.o
  LINK(target) /Users/takuyan/.rbenv/versions/2.2.4/lib/ruby/gems/2.2.0/gems/libv8-3.16.14.13/vendor/v8/out/x64.release/preparser
  CXX(target) /Users/takuyan/.rbenv/versions/2.2.4/lib/ruby/gems/2.2.0/gems/libv8-3.16.14.13/vendor/v8/out/x64.release/obj.target/v8_base/src/accessors.o

extconf failed, exit code 1

Gem files will remain installed in /Users/takuyan/.rbenv/versions/2.2.4/lib/ruby/gems/2.2.0/gems/libv8-3.16.14.13 for inspection.
Results logged to /Users/takuyan/.rbenv/versions/2.2.4/lib/ruby/gems/2.2.0/extensions/x86_64-darwin-15/2.2.0-static/libv8-3.16.14.13/gem_make.out

$ gem install libv8 -- --with-system-v8 することで解決。

http://stackoverflow.com/questions/24081473/how-to-install-therubyracer-gem-on-10-10-yosemite

やっぱりダメだった
rbenv local 2.2.0で回避した。

ruby 2.2.4と相性悪いのかな（相性とは

I also am seeing this with libv8 3.16.14.13

Have tried all the ideas in http://stackoverflow.com/questions/24081473/how-to-install-therubyracer-gem-on-10-10-yosemite

WIth no success. I did update xcode and clang in the last day or two.

rubyjs/libv8#205