操作系统：Mac OS X 10.10.3 XCode：最新安装了命令行工具（6.3版）Rails：4.2.1版Ruby：2.2.1版

当我收到一条错误消息时，我试图为正在处理的项目生成路由（定期执行此操作），并建议我捆绑安装并捆绑执行。我这样做了，这一次，编译JSON
Gem（版本1.7.7）的过程中断了。

对StackOverflow进行了一些研究，建议是更新Xcode的命令行工具，我这样做了，但是并没有解决问题。

我尝试单独安装JSON版本1.7.7，但失败，并告诉我在登录时查找错误：

/Users/zwb/.rvm/rubies/ruby-2.2.1/bin/ruby -r ./siteconf20150411-36070-1t083xl.rb extconf.rb
creating Makefile

make "DESTDIR=" clean

make "DESTDIR="
compiling generator.c
In file included from generator.c:1:
./../fbuffer/fbuffer.h:175:47: error: too few arguments provided to function-like macro invocation
    VALUE result = rb_str_new(FBUFFER_PAIR(fb));
                                              ^
/Users/zwb/.rvm/rubies/ruby-2.2.1/include/ruby-2.2.0/ruby/intern.h:793:9: note: macro 'rb_str_new' defined here
#define rb_str_new(str, len) __extension__ (    \
        ^
In file included from generator.c:1:
./../fbuffer/fbuffer.h:175:11: warning: incompatible pointer to integer conversion initializing 'VALUE' (aka 'unsigned long') with an expression of type 'VALUE (const char *, long)' [-Wint-conversion]
    VALUE result = rb_str_new(FBUFFER_PAIR(fb));
          ^        ~~~~~~~~~~
1 warning and 1 error generated.
make: *** [generator.o] Error 1

make failed, exit code 2