我正在研究Ruby On Rails，每当我尝试安装nokogiri-1.6.7.2时，我都会收到以下错误：
Building native extensions. This could take a while...
ERROR: Error installing nokogiri:
ERROR: Failed to build gem native extension.
current directory: /usr/local/opt/gems/gems/nokogiri-1.6.7.2/ext/nokogiri
/usr/local/bin/ruby -r ./siteconf20160607-19453-7k21kq.rb extconf.rb
Ignoring binding_of_caller-0.7.2 because its extensions are not built. Try: gem pristine binding_of_caller --version 0.7.2
Ignoring byebug-8.2.2 because its extensions are not built. Try: gem pristine byebug --version 8.2.2
Ignoring debug_inspector-0.0.2 because its extensions are not built. Try: gem pristine debug_inspector --version 0.0.2
checking if the C compiler accepts ... yes
checking if the C compiler accepts -Wno-error=unused-command-line-argument-hard-error-in-future... no
Building nokogiri using packaged libraries.
Ignoring nokogiri-1.6.7.2 because its extensions are not built. Try: gem pristine nokogiri --version 1.6.7.2
Ignoring sqlite3-1.3.11 because its extensions are not built. Try: gem pristine sqlite3 --version 1.3.11
*** 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
--without-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=/usr/local/bin/$(RUBY_BASE_NAME)
--help
--clean
--use-system-libraries
/usr/local/lib/ruby/site_ruby/2.3.0/rubygems/core_ext/kernel_require.rb:55:in `require': cannot load such file -- openssl (LoadError)
from /usr/local/lib/ruby/site_ruby/2.3.0/rubygems/core_ext/kernel_require.rb:55:in `require'
from /usr/local/lib/ruby/2.3.0/net/https.rb:23:in `<top (required)>'
from /usr/local/lib/ruby/site_ruby/2.3.0/rubygems/core_ext/kernel_require.rb:55:in `require'
from /usr/local/lib/ruby/site_ruby/2.3.0/rubygems/core_ext/kernel_require.rb:55:in `require'
from /usr/local/lib/ruby/gems/2.3.0/gems/mini_portile2-2.0.0/lib/mini_portile2/mini_portile.rb:3:in `<top (required)>'
from /usr/local/lib/ruby/site_ruby/2.3.0/rubygems/core_ext/kernel_require.rb:55:in `require'
from /usr/local/lib/ruby/site_ruby/2.3.0/rubygems/core_ext/kernel_require.rb:55:in `require'
from /usr/local/lib/ruby/gems/2.3.0/gems/mini_portile2-2.0.0/lib/mini_portile2.rb:2:in `<top (required)>'
from /usr/local/lib/ruby/site_ruby/2.3.0/rubygems/core_ext/kernel_require.rb:55:in `require'
from /usr/local/lib/ruby/site_ruby/2.3.0/rubygems/core_ext/kernel_require.rb:55:in `require'
from extconf.rb:397:in `<main>'
To see why this extension failed to compile, please check the mkmf.log which can be found here:
/usr/local/opt/gems/extensions/x86_64-darwin-15/2.3.0-static/nokogiri-1.6.7.2/mkmf.log
extconf failed, exit code 1
Gem files will remain installed in /usr/local/opt/gems/gems/nokogiri-1.6.7.2 for inspection.
Results logged to /usr/local/opt/gems/extensions/x86_64-darwin-15/2.3.0-static/nokogiri-1.6.7.2/gem_make.out
由于这个 Rails 服务器也没有启动并给我错误.. 请帮助 mkmf 的结果.log如下：-
"clang -o conftest -I/usr/local/include/ruby-2.3.0/x86_64-darwin15 -I/usr/local/include/ruby-2.3.0/ruby/backward -I/usr/local/include/ruby-2.3.0 -I. -D_XOPEN_SOURCE -D_DARWIN_C_SOURCE -D_DARWIN_UNLIMITED_SELECT -D_REENTRANT -O3 -fno-fast-math -ggdb3 -Wall -Wextra -Wno-unused-parameter -Wno-parentheses -Wno-long-long -Wno-missing-field-initializers -Wunused-variable -Wpointer-arith -Wwrite-strings -Wdeclaration-after-statement -Wshorten-64-to-32 -Wimplicit-function-declaration -Wdivision-by-zero -Wdeprecated-declarations -Wextra-tokens -pipe conftest.c -L. -L/usr/local/lib -L. -fstack-protector -L/usr/local/lib -lruby-static -framework CoreFoundation -lpthread -lgmp -ldl -lobjc "
checked program was:
/* begin */
1: #include "ruby.h"
2:
3: int main(int argc, char **argv)
4: {
5: return 0;
6: }
/* end */
"clang -I/usr/local/include/ruby-2.3.0/x86_64-darwin15 -I/usr/local/include/ruby-2.3.0/ruby/backward -I/usr/local/include/ruby-2.3.0 -I. -D_XOPEN_SOURCE -D_DARWIN_C_SOURCE -D_DARWIN_UNLIMITED_SELECT -D_REENTRANT -O3 -fno-fast-math -ggdb3 -Wall -Wextra -Wno-unused-parameter -Wno-parentheses -Wno-long-long -Wno-missing-field-initializers -Wunused-variable -Wpointer-arith -Wwrite-strings -Wdeclaration-after-statement -Wshorten-64-to-32 -Wimplicit-function-declaration -Wdivision-by-zero -Wdeprecated-declarations -Wextra-tokens -pipe -Werror -c conftest.c"
checked program was:
/* begin */
1: #include "ruby.h"
2:
3: int main() {return 0;}
/* end */
"clang -I/usr/local/include/ruby-2.3.0/x86_64-darwin15 -I/usr/local/include/ruby-2.3.0/ruby/backward -I/usr/local/include/ruby-2.3.0 -I. -D_XOPEN_SOURCE -D_DARWIN_C_SOURCE -D_DARWIN_UNLIMITED_SELECT -D_REENTRANT -O3 -fno-fast-math -ggdb3 -Wall -Wextra -Wno-unused-parameter -Wno-parentheses -Wno-long-long -Wno-missing-field-initializers -Wunused-variable -Wpointer-arith -Wwrite-strings -Wdeclaration-after-statement -Wshorten-64-to-32 -Wimplicit-function-declaration -Wdivision-by-zero -Wdeprecated-declarations -Wextra-tokens -pipe -Wno-error=unused-command-line-argument-hard-error-in-future -Werror -c conftest.c"
error: unknown warning option '-Werror=unused-command-line-argument-hard-error-in-future'; did you mean '-Werror=unused-command-line-argument'? [-Werror,-Wunknown-warning-option]
checked program was:
/* begin */
1: #include "ruby.h"
2:
3: int main() {return 0;}
/* end */
谁能帮我解决这个问题。谢谢
这个问题实际上与nokogiri无关，而与rbenv（或者特别是ruby-build）有关。
10 次中有 9 次，运行 xcode-select --install 将解决问题。 如果没有，我建议查看这篇 wiki 文章以确保您的构建环境已正确配置。
如果您之后需要更多帮助，我建议您用rbenv标记您的问题。 就个人而言，由于这样的烦恼，我停止使用它。
尝试安装节点：
sudo apt-get install nodejs