gem安装指南针不工作

在终端中运行线路gem安装指南针时遇到问题。 它返回以下错误。 有人能帮忙解决这个问题吗？

错误：安装罗盘时出错：错误：无法构建gem原生扩展。

/usr/local/rvm/rubies/ruby-1.9.3-p392/bin/ruby -r ./siteconf20150225-51908-cfetpz.rb extconf.rb checking for ffi.h... *** 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/rvm/rubies/ruby-1.9.3-p392/bin/ruby --with-ffi_c-dir --without-ffi_c-dir --with-ffi_c-include --without-ffi_c-include=${ffi_c-dir}/include --with-ffi_c-lib --without-ffi_c-lib=${ffi_c-dir}/lib --with-libffi-config --without-libffi-config --with-pkg-config --without-pkg-config /usr/local/rvm/rubies/ruby-1.9.3-p392/lib/ruby/1.9.1/mkmf.rb:381:in 

try_do': The compiler failed to generate an executable file. (RuntimeError) You have to install development tools first. from /usr/local/rvm/rubies/ruby-1.9.3-p392/lib/ruby/1.9.1/mkmf.rb:506:in try_do': The compiler failed to generate an executable file. (RuntimeError) You have to install development tools first. from /usr/local/rvm/rubies/ruby-1.9.3-p392/lib/ruby/1.9.1/mkmf.rb:506:in try_cpp’来自/usr/local/rvm/rubies/ruby-1.9.3 -p392 / lib / ruby​​ / 1.9.1 / mkmf.rb:931： block in have_header' from /usr/local/rvm/rubies/ruby-1.9.3-p392/lib/ruby/1.9.1/mkmf.rb:790:in中的block in have_header' from /usr/local/rvm/rubies/ruby-1.9.3-p392/lib/ruby/1.9.1/mkmf.rb:790:in check_for中block (2 levels) in postpone' from /usr/local/rvm/rubies/ruby-1.9.3-p392/lib/ruby/1.9.1/mkmf.rb:254:in来自/usr/local/rvm/rubies/ruby-1.9.3-p392/lib/ruby/1.9.1/mkmf.rb:284:in block (2 levels) in postpone' from /usr/local/rvm/rubies/ruby-1.9.3-p392/lib/ruby/1.9.1/mkmf.rb:254:in open’来自/usr/local/rvm/rubies/ruby-1.9.3 -p392 / lib / ruby​​ / 1.9.1 / mkmf.rb：284： block in postpone' from /usr/local/rvm/rubies/ruby-1.9.3-p392/lib/ruby/1.9.1/mkmf.rb:254:in打开’来自/usr/local/rvm/rubies/ruby-1.9.3-p392/lib/ruby/1.9.1/mkmf.rb:280:in postpone' from /usr/local/rvm/rubies/ruby-1.9.3-p392/lib/ruby/1.9.1/mkmf.rb:789:in /usr/local/rvm/rubies/ruby-1.9.3-p392/lib/ruby/1.9 .1 / mkmf.rb:930： have_header' from extconf.rb:16:in ‘

 extconf failed, exit code 1 Gem files will remain installed in /usr/local/rvm/gems/ruby-1.9.3-p392/gems/ffi-1.9.6 for inspection. Results logged to /usr/local/rvm/gems/ruby-1.9.3-p392/extensions/x86_64-darwin-10/1.9.1-static/ffi-1.9.6/gem_make.out 

Answer 1

你得到的错误是

 (RuntimeError) You have to install development tools first. 

如果您使用的是OS X（我对输出的最佳猜测），您需要先安装Xcode开发人员工具。 您可以使用以下命令执行此操作： xcode-select --install 。