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當我嘗試使用安裝引入nokogiri：如何在Mac OS約塞米蒂安裝引入nokogiri
gem install nokogiri
我得到這個錯誤：
ERROR: While executing gem ... (Errno::EACCES)
Permission denied @ rb_sysopen - /usr/local/lib/ruby/gems/2.3.0/gems/nokogiri-1.6.8.1/.autotest
我跑了這兩個命令的第一：
gem update --system
xcode-select --install
任何人都可以看到這裏有什麼問題嗎？
如果我運行使用sudo這個我得到：
ERROR: Error installing nokogiri:
ERROR: Failed to build gem native extension.
current directory: /usr/local/lib/ruby/gems/2.3.0/gems/nokogiri-1.6.8.1/ext/nokogiri
/usr/local/opt/ruby/bin/ruby -r ./siteconf20161127-35515-164lnl6.rb extconf.rb
checking if the C compiler accepts ... *** extconf.rb failed ***
Could not create Makefile due to some reason, probably lack of necessary
libraries and/or headers.
和這裏的日誌文件：
"clang -o conftest -I/usr/local/Cellar/ruby/2.3.3/include/ruby-2.3.0/x86_64-darwin14 -I/usr/local/Cellar/ruby/2.3.3/include/ruby-2.3.0/ruby/backward -I/usr/local/Cellar/ruby/2.3.3/include/ruby-2.3.0 -I. -I/usr/local/opt/libyaml/include -I/usr/local/opt/openssl/include -I/usr/local/opt/readline/include -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 -fno-common -pipe conftest.c -L. -L/usr/local/Cellar/ruby/2.3.3/lib -L/usr/local/opt/libyaml/lib -L/usr/local/opt/openssl/lib -L/usr/local/opt/readline/lib -L. -fstack-protector -L/usr/local/lib -L/usr/local/opt/libyaml/lib -L/usr/local/opt/openssl/lib -L/usr/local/opt/readline/lib -lruby.2.3.0 -lpthread -ldl -lobjc "
Undefined symbols for architecture x86_64:
"start", referenced from:
implicit entry/start for main executable
ld: symbol(s) not found for architecture x86_64
clang: error: linker command failed with exit code 1 (use -v to see invocation)
checked program was:
/* begin */
1: #include "ruby.h"
2:
3: int main(int argc, char **argv)
4: {
5: return 0;
6: }
/* end */