Nokogiri installation error - "Failed to build gem native extension"

[Omkar Sathe]

System: Windows , x64, Ubuntu 20.04, Ruby version: ruby 2.7.1p83, 

When installing rails, I got an error "Failed to build gem native extension". I understood that this is due to a Nokogiri error. 

When trying to install Nokogiri, I am getting the same error "Failed to build gem native extension". Checked on stack, but solutions posted there aren't working. Please help!  

omkars@LAPTOP-7GPXXXX:~$ sudo gem install nokogiri

Building native extensions. This could take a while...

ERROR:  Error installing nokogiri:

        ERROR: Failed to build gem native extension.

    current directory: /var/lib/gems/2.7.0/gems/nokogiri-1.10.10/ext/nokogiri

/usr/bin/ruby2.7 -I /usr/lib/ruby/2.7.0 -r ./siteconf20200803-1803-ir1hod.rb extconf.rb

checking if the C compiler accepts ... *** extconf.rb failed ***

Could not create Makefile due to some reason, probably lack of necessary

libraries and/or headers.  Check the mkmf.log file for more details.  You may

need configuration options.

Provided configuration options:

        --with-opt-dir

        --without-opt-dir

        --with-opt-include

        --without-opt-include=${opt-dir}/include

        --with-opt-lib

        --without-opt-lib=${opt-dir}/lib

        --with-make-prog

        --without-make-prog

        --srcdir=.

        --curdir

        --ruby=/usr/bin/$(RUBY_BASE_NAME)2.7

        --help

        --clean

/usr/lib/ruby/2.7.0/mkmf.rb:471:in `try_do': The compiler failed to generate an executable file. (RuntimeError)

You have to install development tools first.

        from /usr/lib/ruby/2.7.0/mkmf.rb:597:in `block in try_compile'

        from /usr/lib/ruby/2.7.0/mkmf.rb:544:in `with_werror'

        from /usr/lib/ruby/2.7.0/mkmf.rb:597:in `try_compile'

        from extconf.rb:138:in `nokogiri_try_compile'

        from extconf.rb:162:in `block in add_cflags'

        from /usr/lib/ruby/2.7.0/mkmf.rb:655:in `with_cflags'

        from extconf.rb:161:in `add_cflags'

        from extconf.rb:416:in `<main>'

To see why this extension failed to compile, please check the mkmf.log which can be found here:

  /var/lib/gems/2.7.0/extensions/x86_64-linux/2.7.0/nokogiri-1.10.10/mkmf.log

extconf failed, exit code 1

Gem files will remain installed in /var/lib/gems/2.7.0/gems/nokogiri-1.10.10 for inspection.

Results logged to /var/lib/gems/2.7.0/extensions/x86_64-linux/2.7.0/nokogiri-1.10.10/gem_make.out

[Mike Dalessio]

Hi! Sorry you're having problems, I'll try to help.

The error message says:

> You have to install development tools first.

I believe this means you don't have some part of the compiler tool chain that's needed to compile gems that have C extensions. You could verify this by trying to install a simpler gem that has a C extension, like 'bcrypt'. If the installation of 'bcrypt' fails in a similar manner, then this is the issue.

In that case, I'd recommend that you ask on a more general ruby forum how to install the compiler tool chain on your system and for the version of ruby you've installed.

I hope this helps!

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[Omkar Sathe]

Thank you, Mike, for your help.

After a few hours of trying to resolve this, what finally worked was downgrading from Ubuntu 20.04 to 18.

To view this discussion on the web visit https://groups.google.com/d/msgid/nokogiri-talk/CAGJbjKbKsBH1rSXf9hpAht1z3s12CNPa%2BycPNWqKiqwp0h%3DLXQ%40mail.gmail.com.