Ruby &引用；由于某些原因，无法创建Makefile，“'；尝试安装gem时出错

当我试图下载一个ruby gem时，我得到了这个错误

RaviAir:~ ravi$ gem install squib
Building native extensions.  This could take a while...
ERROR:  Error installing squib:
    ERROR: Failed to build gem native extension.

    current directory: /Users/ravi/.rvm/gems/ruby-2.4.0/gems/cairo-1.15.9/ext/cairo
/Users/ravi/.rvm/rubies/ruby-2.4.0/bin/ruby -r ./siteconf20170809-20153-okwab6.rb extconf.rb
checking for GCC... yes
checking for Win32 OS... no
checking for cairo version (>= 1.2.0)... yes
*** 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/ravi/.rvm/rubies/ruby-2.4.0/bin/$(RUBY_BASE_NAME)
    --with-pkg-config
    --without-pkg-config
    --with-override-variables
    --without-override-variables
/Users/ravi/.rvm/gems/ruby-2.4.0/gems/pkg-config-1.2.4/lib/pkg-config.rb:299:in `parse_pc': .pc for zlib doesn't exist. (RuntimeError)
    from /Users/ravi/.rvm/gems/ruby-2.4.0/gems/pkg-config-1.2.4/lib/pkg-config.rb:196:in `declaration'
    from /Users/ravi/.rvm/gems/ruby-2.4.0/gems/pkg-config-1.2.4/lib/pkg-config.rb:210:in `collect_cflags'
    from /Users/ravi/.rvm/gems/ruby-2.4.0/gems/pkg-config-1.2.4/lib/pkg-config.rb:145:in `cflags'
    from /Users/ravi/.rvm/gems/ruby-2.4.0/gems/pkg-config-1.2.4/lib/pkg-config.rb:212:in `block in collect_cflags'
    from /Users/ravi/.rvm/gems/ruby-2.4.0/gems/pkg-config-1.2.4/lib/pkg-config.rb:211:in `collect'
    from /Users/ravi/.rvm/gems/ruby-2.4.0/gems/pkg-config-1.2.4/lib/pkg-config.rb:211:in `collect_cflags'
    from /Users/ravi/.rvm/gems/ruby-2.4.0/gems/pkg-config-1.2.4/lib/pkg-config.rb:145:in `cflags'
    from /Users/ravi/.rvm/gems/ruby-2.4.0/gems/pkg-config-1.2.4/lib/pkg-config.rb:215:in `block in collect_cflags'
    from /Users/ravi/.rvm/gems/ruby-2.4.0/gems/pkg-config-1.2.4/lib/pkg-config.rb:214:in `collect'
    from /Users/ravi/.rvm/gems/ruby-2.4.0/gems/pkg-config-1.2.4/lib/pkg-config.rb:214:in `collect_cflags'
    from /Users/ravi/.rvm/gems/ruby-2.4.0/gems/pkg-config-1.2.4/lib/pkg-config.rb:154:in `cflags_only_other'
    from /Users/ravi/.rvm/gems/ruby-2.4.0/gems/pkg-config-1.2.4/lib/pkg-config.rb:452:in `cflags_only_other'
    from /Users/ravi/.rvm/gems/ruby-2.4.0/gems/pkg-config-1.2.4/lib/pkg-config.rb:499:in `have_package'
    from extconf.rb:52:in `required_pkg_config_package'
    from extconf.rb:60:in `<main>'

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

  /Users/ravi/.rvm/gems/ruby-2.4.0/extensions/x86_64-darwin-14/2.4.0/cairo-1.15.9/mkmf.log

extconf failed, exit code 1

Gem files will remain installed in /Users/ravi/.rvm/gems/ruby-2.4.0/gems/cairo-1.15.9 for inspection.
Results logged to /Users/ravi/.rvm/gems/ruby-2.4.0/extensions/x86_64-darwin-14/2.4.0/cairo-1.15.9/gem_make.out

我已经确保安装了Xcode命令，但我认为我没有安装Xcode应用程序（不确定这是否有意义），我已经下载并更新了homebrew

我认为错误是

/Users/ravi/.rvm/gems/ruby-2.4.0/gems/pkg-config-1.2.4/lib/pkg-config.rb:299:in `parse_pc': .pc for zlib doesn't exist.

我用一个文本编辑器“升华”打开了它。 但我不知道如何解决这个问题。请帮忙

---

更多细节：我正在使用ruby 2.4，我有OS X Yosemite版本10.10.5。

这是这个问题的重复：

是的，对不起，我不确定github是否仍然处于活动状态。如果有版主在场，请随意删除此帖子。

/Users/ravi/.rvm/gems/ruby-2.4.0/gems/pkg-config-1.2.4/lib/pkg-config.rb:299:in `parse_pc': .pc for zlib doesn't exist.