我正在尝试在Mavericks上安装以下gem版本
- libv8（3.16.14.3）
- therubyracer（0.12.1）
显然，therubyracer宝石依赖于libv8。
1）安装libv8
什么是libv8？我的研究似乎表明它是Google Chrome使用的某种javascript库？
我在安装它时遇到了麻烦，但是这篇出色的文章既包含了我的错误，也提供了关于如何绕过它的解释清楚的答案。
所以我安装libv8了
gem install libv8 -- --with-system-v8
据我了解，这安装了gem，但是使用了v8库的本地系统安装，而不是... gem随附的版本？无论哪种方式，它都是成功的。
2）安装rubyracer
在下一步中，我无法安装therubyracergem。我不太确定这个gem的功能，只是我要尝试的Rails项目的依赖项bundle install。
它给了我以下错误：
Gem::Ext::BuildError: ERROR: Failed to build gem native extension.
/Users/jeeves.butler/.rvm/rubies/ruby-1.9.2-p290/bin/ruby extconf.rb
checking for main() in -lpthread... yes
checking for main() in -lobjc... yes
checking for v8.h... no
*** extconf.rb failed ***
Could not create Makefile due to some reason, probably lack of
necessary libraries and/or headers. Check the mkmf.log file for more
details. You may need configuration options.
Provided configuration options:
--with-opt-dir
--with-opt-include
--without-opt-include=${opt-dir}/include
--with-opt-lib
--without-opt-lib=${opt-dir}/lib
--with-make-prog
--without-make-prog
--srcdir=.
--curdir
--ruby=/Users/jeeves.butler/.rvm/rubies/ruby-1.9.2-p290/bin/ruby
--with-pthreadlib
--without-pthreadlib
--with-objclib
--without-objclib
--enable-debug
--disable-debug
--with-v8-dir
--without-v8-dir
--with-v8-include
--without-v8-include=${v8-dir}/include
--with-v8-lib
--without-v8-lib=${v8-dir}/lib
/Users/jeeves.butler/.rvm/gems/ruby-1.9.2-p290/gems/libv8-3.16.14.3/ext/libv8/location.rb:50:in
'configure': You have chosen to use the version of V8 found
on your system (Libv8::Location::System::NotFoundError)
and *not* the one that is bundled with the libv8 rubygem. However,
it could not be located. please make sure you have a version of
v8 that is compatible with 3.16.14.3 installed. You may
need to special --with-v8-dir options if it is in a non-standard
location
thanks,
The Mgmt
from /Users/jeeves.butler/.rvm/gems/ruby-1.9.2-p290/gems/libv8-3.16.14.3/lib/libv8.rb:7:in `configure_makefile'
from extconf.rb:32:in `<main>'
extconf failed, exit code 1
Gem files will remain installed in /Users/jeeves.butler/.rvm/gems/ruby-1.9.2-p290/gems/therubyracer-0.12.1 for inspection.
Results logged to /Users/jeeves.butler/.rvm/gems/ruby-1.9.2-p290/extensions/x86_64-darwin-13/1.9.1/therubyracer-0.12.1/gem_make.out
据我所知，我选择libv8使用本地V8库而不是随提供的库进行安装libv8，但是现在找不到本地安装。
- 如何检查是否确实安装了V8，如何找到它？
- 我尝试了一些指定的标志，它们似乎都没有将gem指向正确的安装目录
- 这可能是一个单独的主题，但这是什么
extconf.rb？我已经在几个地方看到过。gcc具体来说，它与编译器有什么关系？
谢谢！！
编辑：