安装 json Ruby gem 时出错

Question

我正在运行gem install json -v '1.8.1'，但出现此错误..

gem install json -v '1.8.1'
Building native extensions.  This could take a while...
ERROR:  Error installing json:
    ERROR: Failed to build gem native extension.

    current directory: /Users/johnwilliamson/.rvm/gems/ruby-2.4.1/gems/json-1.8.1/ext/json/ext/generator
/Users/johnwilliamson/.rvm/rubies/ruby-2.4.1/bin/ruby -r ./siteconf20170412-72871-wada1h.rb extconf.rb
creating Makefile

current directory: /Users/johnwilliamson/.rvm/gems/ruby-2.4.1/gems/json-1.8.1/ext/json/ext/generator
make "DESTDIR=" clean

current directory: /Users/johnwilliamson/.rvm/gems/ruby-2.4.1/gems/json-1.8.1/ext/json/ext/generator
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/johnwilliamson/.rvm/rubies/ruby-2.4.1/include/ruby-2.4.0/ruby/intern.h:795:9: note: macro 'rb_str_new' defined here
#define rb_str_new(str, len) RB_GNUC_EXTENSION_BLOCK(   \
        ^
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)' (aka 'unsigned long (const char *, long)') [-Wint-conversion]
    VALUE result = rb_str_new(FBUFFER_PAIR(fb));
          ^        ~~~~~~~~~~
generator.c:840:25: error: use of undeclared identifier 'rb_cFixnum'
    } else if (klass == rb_cFixnum) {
                        ^
generator.c:842:25: error: use of undeclared identifier 'rb_cBignum'
    } else if (klass == rb_cBignum) {
                        ^
1 warning and 3 errors generated.
make: *** [generator.o] Error 1

make failed, exit code 2

Gem files will remain installed in /Users/johnwilliamson/.rvm/gems/ruby-2.4.1/gems/json-1.8.1 for inspection.
Results logged to /Users/johnwilliamson/.rvm/gems/ruby-2.4.1/extensions/x86_64-darwin-16/2.4.0/json-1.8.1/gem_make.out

当我只运行 gem install json 时，它安装得很好，可以让我超过版本 2，但是我正在尝试安装此https://github.com/peatio/peatio并且它特别需要该版本。

还有其他想法吗？

Answer 1

该问题是由于您不在正确的目录中而出现的。请先转到您的 Rails 目录文件夹，然后运行以下命令，如下所示：

rails@rails:~/rails_project/btc$ gem install json -v '1.8.1'

然后它的工作正常。