Childprocess has ruby version restrictions

Author: robotdana

Gemfile

@@ -36,7 +36,7 @@ group :documentation do
   gem 'github-markup', :platform => :mri
 end
 
-if RUBY_VERSION < '2.0.0' || RUBY_ENGINE == 'java'
+if RUBY_VERSION < '2.0.0' || RUBY_PLATFORM == 'java'
   gem 'json', '< 2.0.0'
 else
   gem 'json', '> 2.3.0'
@@ -52,14 +52,18 @@ end
 
 if RUBY_VERSION < '2.2.0' && !!(RbConfig::CONFIG['host_os'] =~ /cygwin|mswin|mingw|bccwin|wince|emx/)
   gem "childprocess", "< 1.0.0"
+elsif RUBY_VERSION < '1.9.0' && RUBY_PLATFORM == 'java'
+  gem "childprocess", "< 1.0.0"
+elsif RUBY_VERSION < '2.3.0'
+  gem "childprocess", "< 2.0.0"
+elsif RUBY_VERSION < '2.4.0'
+  gem "childprocess", "< 4.0.0"
 end
 
 platforms :jruby do
   if RUBY_VERSION < '1.9.0'
     # Pin jruby-openssl on older J Ruby
     gem "jruby-openssl", "< 0.10.0"
-    # Pin child-process on older J Ruby
-    gem "childprocess", "< 1.0.0"
   else
     gem "jruby-openssl"
   end