json1.7.4

[Liu-XiaoDao]

Gem::Ext::BuildError: ERROR: Failed to build gem native extension.

current directory: /usr/local/rvm/gems/ruby-2.3.1/gems/json-1.7.4/ext/json/ext/generator

/usr/local/rvm/rubies/ruby-2.3.1/bin/ruby -r ./siteconf20170915-5671-1g31pvd.rb extconf.rb
creating Makefile

current directory: /usr/local/rvm/gems/ruby-2.3.1/gems/json-1.7.4/ext/json/ext/generator
make "DESTDIR=" clean

current directory: /usr/local/rvm/gems/ruby-2.3.1/gems/json-1.7.4/ext/json/ext/generator
make "DESTDIR="
compiling generator.c
In file included from generator.c:1:0:
../fbuffer/fbuffer.h: In function 'fbuffer_to_s':
../fbuffer/fbuffer.h:158:47: error: macro "rb_str_new" requires 2 arguments, but only 1 given
VALUE result = rb_str_new(FBUFFER_PAIR(fb));
^
../fbuffer/fbuffer.h:158:20: warning: initialization makes integer from pointer without a cast [-Wint-conversion]
VALUE result = rb_str_new(FBUFFER_PAIR(fb));
^
In file included from generator.c:2:0:
generator.c: In function 'cState_aref':
generator.h:96:27: warning: variable 'state' set but not used [-Wunused-but-set-variable]
JSON_Generator_State *state;
^
generator.c:632:5: note: in expansion of macro 'GET_STATE'
GET_STATE(self);
^
Makefile:238: recipe for target 'generator.o' failed
make: *** [generator.o] Error 1

make failed, exit code 2

Gem files will remain installed in /usr/local/rvm/gems/ruby-2.3.1/gems/json-1.7.4 for inspection.
Results logged to /usr/local/rvm/gems/ruby-2.3.1/extensions/x86_64-linux/2.3.0/json-1.7.4/gem_make.out

An error occurred while installing json (1.7.4), and Bundler cannot continue.
Make sure that gem install json -v '1.7.4' succeeds before bundling.

In Gemfile:
activeadmin was resolved to 0.4.4, which depends on
devise was resolved to 2.1.2, which depends on
railties was resolved to 3.2.7, which depends on
rdoc was resolved to 3.12, which depends on
json