Ruby on Rails の開発環境を構築中

開発環境：

macOS Mojave

$ ruby -v
ruby 2.6.1p33 (2019-01-30 revision 66950) [x86_64-darwin18]

$ rbenv version
2.6.1 (set by /Users/username/.rbenv/version)

以下のコマンドを実行すると、、、

$ bundle install --path=vendor/bundle

Gem::Ext::BuildError: ERROR: Failed to build gem native extension. になります（汗）

Fetching gem metadata from https://rubygems.org/.............
Fetching gem metadata from https://rubygems.org/.
Resolving dependencies...
Using rake 12.3.2
Using concurrent-ruby 1.1.5
Using i18n 1.6.0
Using minitest 5.11.3
Using thread_safe 0.3.6
Using tzinfo 1.2.5
Using activesupport 5.2.3
Using builder 3.2.3
Using erubi 1.8.0
Using mini_portile2 2.4.0
Fetching nokogiri 1.10.3
Installing nokogiri 1.10.3 with native extensions
Gem::Ext::BuildError: ERROR: Failed to build gem native extension.

    current directory: /Users/username/Develop/Ruby/myapp/vendor/bundle/ruby/2.6.0/gems/nokogiri-1.10.3/ext/nokogiri
/Users/username/.rbenv/versions/2.6.1/bin/ruby -I /Users/username/.rbenv/versions/2.6.1/lib/ruby/2.6.0 -r ./siteconf20190510-40753-10jfnoy.rb extconf.rb
checking if the C compiler accepts  -I /Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/include/libxml2... *** 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=/Users/username/.rbenv/versions/2.6.1/bin/$(RUBY_BASE_NAME)
	--help
	--clean
/Users/username/.rbenv/versions/2.6.1/lib/ruby/2.6.0/mkmf.rb:467:in `try_do': The compiler failed to generate an executable file. (RuntimeError)
You have to install development tools first.
	from /Users/username/.rbenv/versions/2.6.1/lib/ruby/2.6.0/mkmf.rb:585:in `block in try_compile'
	from /Users/username/.rbenv/versions/2.6.1/lib/ruby/2.6.0/mkmf.rb:532:in `with_werror'
	from /Users/username/.rbenv/versions/2.6.1/lib/ruby/2.6.0/mkmf.rb:585:in `try_compile'
	from extconf.rb:138:in `nokogiri_try_compile'
	from extconf.rb:162:in `block in add_cflags'
	from /Users/digi-angler/.rbenv/versions/2.6.1/lib/ruby/2.6.0/mkmf.rb:643:in `with_cflags'
	from extconf.rb:161:in `add_cflags'
	from extconf.rb:416:in `<main>'

To see why this extension failed to compile, please check the mkmf.log which can be found here:

  /Users/username/Develop/Ruby/myapp/vendor/bundle/ruby/2.6.0/extensions/x86_64-darwin-18/2.6.0-static/nokogiri-1.10.3/mkmf.log

extconf failed, exit code 1

Gem files will remain installed in /Users/username/Develop/Ruby/myapp/vendor/bundle/ruby/2.6.0/gems/nokogiri-1.10.3 for inspection.
Results logged to /Users/username/Develop/Ruby/myapp/vendor/bundle/ruby/2.6.0/extensions/x86_64-darwin-18/2.6.0-static/nokogiri-1.10.3/gem_make.out

An error occurred while installing nokogiri (1.10.3), and Bundler cannot continue.
Make sure that `gem install nokogiri -v '1.10.3' --source 'https://rubygems.org/'` succeeds before bundling.

In Gemfile:
  rails was resolved to 5.2.3, which depends on
    actioncable was resolved to 5.2.3, which depends on
      actionpack was resolved to 5.2.3, which depends on
        actionview was resolved to 5.2.3, which depends on
          rails-dom-testing was resolved to 2.0.3, which depends on
            nokogiri

mkmf.log

"clang -o conftest -I/Users/username/.rbenv/versions/2.6.1/include/ruby-2.6.0/x86_64-darwin18 -I/Users/username/.rbenv/versions/2.6.1/include/ruby-2.6.0/ruby/backward -I/Users/username/.rbenv/versions/2.6.1/include/ruby-2.6.0 -I. -I/Users/username/.rbenv/versions/2.6.1/include  -D_XOPEN_SOURCE -D_DARWIN_C_SOURCE -D_DARWIN_UNLIMITED_SELECT -D_REENTRANT    -O3 -Wno-error=shorten-64-to-32  -pipe  -I /Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/include/libxml2 conftest.c  -L. -L/Users/username/.rbenv/versions/2.6.1/lib -L. -L/Users/digi-angler/.rbenv/versions/2.6.1/lib  -fstack-protector-strong -L/usr/local/lib     -lruby.2.6-static -framework Security -framework Foundation -lpthread -lgmp -ldl -lobjc    "
In file included from conftest.c:1:
In file included from /Users/username/.rbenv/versions/2.6.1/include/ruby-2.6.0/ruby.h:33:
In file included from /Users/username/.rbenv/versions/2.6.1/include/ruby-2.6.0/ruby/ruby.h:29:
/Users/username/.rbenv/versions/2.6.1/include/ruby-2.6.0/ruby/defines.h:123:10: fatal error: 'stdio.h' file not found
#include <stdio.h>
         ^~~~~~~~~
1 error generated.
checked program was:
/* begin */
1: #include "ruby.h"
2: 
3: int main(int argc, char **argv)
4: {
5:   return 0;
6: }
/* end */

原因は何？

しばらくググって調べましたが、ネット上にある記事が古かったり、バージョンが違ったり、
やっていること（解決方法）が違ったり・・・

nokogiriがコンパイルに失敗して、
インストールも失敗しているんですかね・・・

ライブラリ（libxml2）が不足？しているんですかね？

解決方法をご教授願います。

行動規範の内容に同意します

回答2件

/Users/username/.rbenv/versions/2.6.1/include/ruby-2.6.0/ruby/defines.h:123:10: fatal error: 'stdio.h' file not found
#include <stdio.h>
         ^~~~~~~~~
1 error generated.

https://github.com/sparklemotion/nokogiri/issues/1801

Command Line Tools for Xcode のインストールはお済みでしょうか。

投稿2019/05/10 08:46