Error during deployment in Heroku

[jayomayan]

-----> Ruby app detected
-----> Compiling Ruby
-----> Using Ruby version: ruby-2.5.3
-----> Installing dependencies using bundler 1.15.2
Running: bundle install --without development:test --path vendor/bundle --binstubs vendor/bundle/bin -j4 --deployment
Fetching gem metadata from https://rubygems.org/.............
Fetching version metadata from https://rubygems.org/.
Using bundler 1.15.2
Fetching json 1.8.3
Fetching multi_xml 0.5.5
Installing multi_xml 0.5.5
Installing json 1.8.3 with native extensions
Gem::Ext::BuildError: ERROR: Failed to build gem native extension.

   current directory:
   /tmp/build_716e2c940330b6e6503ae6d8c2e4bb0e/vendor/bundle/ruby/2.5.0/gems/json-1.8.3/ext/json/ext/generator
   /tmp/build_716e2c940330b6e6503ae6d8c2e4bb0e/vendor/ruby-2.5.3/bin/ruby -r
   ./siteconf20190611-214-2p82jr.rb extconf.rb
   creating Makefile
   
   current directory:
   /tmp/build_716e2c940330b6e6503ae6d8c2e4bb0e/vendor/bundle/ruby/2.5.0/gems/json-1.8.3/ext/json/ext/generator
   make "DESTDIR=" clean
   
   current directory:
   /tmp/build_716e2c940330b6e6503ae6d8c2e4bb0e/vendor/bundle/ruby/2.5.0/gems/json-1.8.3/ext/json/ext/generator
   make "DESTDIR="
   compiling generator.c
   generator.c: In function ‘generate_json’:
   generator.c:861:25: error: ‘rb_cFixnum’ undeclared (first use in this function);
   did you mean ‘mFixnum’?
        } else if (klass == rb_cFixnum) {
                            ^~~~~~~~~~
                            mFixnum
   generator.c:861:25: note: each undeclared identifier is reported only once for
   each function it appears in
   generator.c:863:25: error: ‘rb_cBignum’ undeclared (first use in this function);
   did you mean ‘rb_cFixnum’?
        } else if (klass == rb_cBignum) {
                            ^~~~~~~~~~
                            rb_cFixnum
   generator.c: At top level:
   cc1: warning: unrecognized command line option ‘-Wno-self-assign’
   cc1: warning: unrecognized command line option ‘-Wno-constant-logical-operand’
   cc1: warning: unrecognized command line option ‘-Wno-parentheses-equality’
   Makefile:241: recipe for target 'generator.o' failed
   make: *** [generator.o] Error 1
   
   make failed, exit code 2
   
   Gem files will remain installed in
   /tmp/build_716e2c940330b6e6503ae6d8c2e4bb0e/vendor/bundle/ruby/2.5.0/gems/json-1.8.3
   for inspection.
   Results logged to
   /tmp/build_716e2c940330b6e6503ae6d8c2e4bb0e/vendor/bundle/ruby/2.5.0/extensions/x86_64-linux/2.5.0/json-1.8.3/gem_make.out
   
   An error occurred while installing json (1.8.3), and Bundler cannot continue.
   Make sure that `gem install json -v '1.8.3'` succeeds before bundling.
   
   In Gemfile:
     httparty was resolved to 0.13.5, which depends on
       json
   Bundler Output: Fetching gem metadata from https://rubygems.org/.............
   Fetching version metadata from https://rubygems.org/.
   Using bundler 1.15.2
   Fetching json 1.8.3
   Fetching multi_xml 0.5.5
   Installing multi_xml 0.5.5
   Installing json 1.8.3 with native extensions
   Gem::Ext::BuildError: ERROR: Failed to build gem native extension.
   
   current directory:
   /tmp/build_716e2c940330b6e6503ae6d8c2e4bb0e/vendor/bundle/ruby/2.5.0/gems/json-1.8.3/ext/json/ext/generator
   /tmp/build_716e2c940330b6e6503ae6d8c2e4bb0e/vendor/ruby-2.5.3/bin/ruby -r
   ./siteconf20190611-214-2p82jr.rb extconf.rb
   creating Makefile
   
   current directory:
   /tmp/build_716e2c940330b6e6503ae6d8c2e4bb0e/vendor/bundle/ruby/2.5.0/gems/json-1.8.3/ext/json/ext/generator
   make "DESTDIR=" clean
   
   current directory:
   /tmp/build_716e2c940330b6e6503ae6d8c2e4bb0e/vendor/bundle/ruby/2.5.0/gems/json-1.8.3/ext/json/ext/generator
   make "DESTDIR="
   compiling generator.c
   generator.c: In function ‘generate_json’:
   generator.c:861:25: error: ‘rb_cFixnum’ undeclared (first use in this function);
   did you mean ‘mFixnum’?
        } else if (klass == rb_cFixnum) {
                            ^~~~~~~~~~
                            mFixnum
   generator.c:861:25: note: each undeclared identifier is reported only once for
   each function it appears in
   generator.c:863:25: error: ‘rb_cBignum’ undeclared (first use in this function);
   did you mean ‘rb_cFixnum’?
        } else if (klass == rb_cBignum) {
                            ^~~~~~~~~~
                            rb_cFixnum
   generator.c: At top level:
   cc1: warning: unrecognized command line option ‘-Wno-self-assign’
   cc1: warning: unrecognized command line option ‘-Wno-constant-logical-operand’
   cc1: warning: unrecognized command line option ‘-Wno-parentheses-equality’
   Makefile:241: recipe for target 'generator.o' failed
   make: *** [generator.o] Error 1
   
   make failed, exit code 2
   
   Gem files will remain installed in
   /tmp/build_716e2c940330b6e6503ae6d8c2e4bb0e/vendor/bundle/ruby/2.5.0/gems/json-1.8.3
   for inspection.
   Results logged to
   /tmp/build_716e2c940330b6e6503ae6d8c2e4bb0e/vendor/bundle/ruby/2.5.0/extensions/x86_64-linux/2.5.0/json-1.8.3/gem_make.out
   
   An error occurred while installing json (1.8.3), and Bundler cannot continue.
   Make sure that `gem install json -v '1.8.3'` succeeds before bundling.
   
   In Gemfile:
     httparty was resolved to 0.13.5, which depends on
       json

!
! Failed to install gems via Bundler.
!
! Push rejected, failed to compile Ruby app.
! Push failed