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

[AhmedNadar]

I'm trying to install Rails 4.2.6. My ruby version is ruby 2.4.0dev (2016-06-18) [x86_64-darwin15]
I get the following error every time i run bundle install

Building native extensions.  This could take a while...
Installing yajl-ruby 1.2.1 with native extensions

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

    current directory: /Users/ahmed/.rbenv/versions/2.3.0-dev/lib/ruby/gems/2.4.0/gems/yajl-ruby-1.2.1/ext/yajl
/Users/ahmed/.rbenv/versions/2.3.0-dev/bin/ruby -r ./siteconf20160618-95324-tgmf65.rb extconf.rb
creating Makefile

current directory: /Users/ahmed/.rbenv/versions/2.3.0-dev/lib/ruby/gems/2.4.0/gems/yajl-ruby-1.2.1/ext/yajl
make "DESTDIR=" clean

current directory: /Users/ahmed/.rbenv/versions/2.3.0-dev/lib/ruby/gems/2.4.0/gems/yajl-ruby-1.2.1/ext/yajl
make "DESTDIR="
compiling yajl.c
compiling yajl_alloc.c
compiling yajl_buf.c
compiling yajl_encode.c
compiling yajl_ext.c
yajl_ext.c:881:22: error: use of undeclared identifier 'rb_cFixnum'
    rb_define_method(rb_cFixnum, "to_json", rb_yajl_json_ext_fixnum_to_json, -1);
                     ^
1 error generated.
make: *** [yajl_ext.o] Error 1

make failed, exit code 2

Gem files will remain installed in /Users/ahmed/.rbenv/versions/2.3.0-dev/lib/ruby/gems/2.4.0/gems/yajl-ruby-1.2.1 for inspection.
Results logged to /Users/ahmed/.rbenv/versions/2.3.0-dev/lib/ruby/gems/2.4.0/extensions/x86_64-darwin-15/2.4.0-static/yajl-ruby-1.2.1/gem_make.out

Any solution?

[denisdefreyne]

I believe you’re looking for #165.

[imkaywu]

So how to fix this issue exactly? sorry in advance if this is a dumb question, I'm really new to ruby.

[zegomesjf]

@imkaywu you should use
ruby < 2.4 with yajl-ruby 1.2.1 or
use Ruby >= 2.4 with the latest version of yajl-ruby >= 1.3

[imkaywu]

I did the same the thing as your first suggestion, and it worked. thanks

[hshivam00]

Thank you for the update, but I'm still facing the same issue:

**C:\Ubuntu_1804_OnWindows_WSL\wpscanteam-wpscan-2.9.1-58-g89c0b8d\wpscanteam-wpscan-89c0b8d>gem install yajl-ruby -v '1.4.1' --source 'https://rubygems.org/'
Temporarily enhancing PATH for MSYS/MINGW...
Building native extensions. This could take a while...
ERROR: Error installing yajl-ruby:
ERROR: Failed to build gem native extension.

current directory: C:/Ruby26-x64/lib/ruby/gems/2.6.0/gems/yajl-ruby-1.4.1/ext/yajl

C:/Ruby26-x64/bin/ruby.exe -I C:/Ruby26-x64/lib/ruby/2.6.0 -r ./siteconf20190625-14176-q8gsld.rb extconf.rb
creating Makefile

current directory: C:/Ruby26-x64/lib/ruby/gems/2.6.0/gems/yajl-ruby-1.4.1/ext/yajl
make "DESTDIR=" clean
current directory: C:/Ruby26-x64/lib/ruby/gems/2.6.0/gems/yajl-ruby-1.4.1/ext/yajl
make "DESTDIR="
make failedNo such file or directory - make "DESTDIR="

Gem files will remain installed in C:/Ruby26-x64/lib/ruby/gems/2.6.0/gems/yajl-ruby-1.4.1 for inspection.
Results logged to C:/Ruby26-x64/lib/ruby/gems/2.6.0/extensions/x64-mingw32/2.6.0/yajl-ruby-1.4.1/gem_make.out

C:\Ubuntu_1804_OnWindows_WSL\wpscanteam-wpscan-2.9.1-58-g89c0b8d\wpscanteam-wpscan-89c0b8d>gem install yajl-ruby >= 1.3 --source 'https://rubygems.org/'
ERROR: Error installing yajl-ruby:
ERROR: Failed to build gem native extension.

current directory: C:/Ruby26-x64/lib/ruby/gems/2.6.0/gems/yajl-ruby-1.4.1/ext/yajl

C:/Ruby26-x64/bin/ruby.exe -I C:/Ruby26-x64/lib/ruby/2.6.0 -r ./siteconf20190625-7436-wcaipg.rb extconf.rb
creating Makefile

current directory: C:/Ruby26-x64/lib/ruby/gems/2.6.0/gems/yajl-ruby-1.4.1/ext/yajl
make "DESTDIR=" clean
current directory: C:/Ruby26-x64/lib/ruby/gems/2.6.0/gems/yajl-ruby-1.4.1/ext/yajl
make "DESTDIR="
make failedNo such file or directory - make "DESTDIR="

Gem files will remain installed in C:/Ruby26-x64/lib/ruby/gems/2.6.0/gems/yajl-ruby-1.4.1 for inspection.
Results logged to C:/Ruby26-x64/lib/ruby/gems/2.6.0/extensions/x64-mingw32/2.6.0/yajl-ruby-1.4.1/gem_make.out**