Build fail on Linux

[Ryuno-Ki]

This occured to me when trying to install jekyll-webmention_io, see aarongustafson/jekyll-webmention_io#75.

$ bundle install
Fetching gem metadata from https://rubygems.org/..........                                                                                                              
Fetching gem metadata from https://rubygems.org/.                                                                                                                       
Resolving dependencies...                                                                                                                                               
Using public_suffix 2.0.5                                                                                                                                               
Using addressable 2.5.1                                                                                                                                                 
Using bundler 1.16.0                                                                                                                                                    
Using colorator 1.1.0                                                                                                                                                   
Fetching unf_ext 0.0.7.5                                                                                                                                                
Installing unf_ext 0.0.7.5 with native extensions                                                                                                                       
Gem::Ext::BuildError: ERROR: Failed to build gem native extension.                                                                                                      
                                                                                                                                                                        
    current directory: $HOME/.gem/ruby/2.3.0/gems/unf_ext-0.0.7.5/ext/unf_ext                                                                                    
/usr/bin/ruby23 -r ./siteconf20180225-16640-mruchr.rb extconf.rb                                                                                                        
checking for main() in -lstdc++... *** 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}/lib64                                                                                                                              
        --with-make-prog                                                                                                                                                
        --without-make-prog                                                                                                                                             
        --srcdir=.                                                                                                                                                      
        --curdir                                                                                                                                                        
        --ruby=/usr/bin/$(RUBY_BASE_NAME)23                                                                                                                             
        --with-static-libstdc++                                                                                                                                         
        --without-static-libstdc++                                                                                                                                      
        --with-stdc++lib                                                                                                                                                
        --without-stdc++lib                                                                                                                                             
/usr/lib64/ruby/2.3.0/mkmf.rb:456:in `try_do': The compiler failed to generate an                                                                                       
executable file. (RuntimeError)                                                                                                                                         
You have to install development tools first.                                                                                                                            
        from /usr/lib64/ruby/2.3.0/mkmf.rb:541:in `try_link0'                                                                                                           
        from /usr/lib64/ruby/2.3.0/mkmf.rb:556:in `try_link'                                                                                                            
        from /usr/lib64/ruby/2.3.0/mkmf.rb:765:in `try_func'                                                                                                            
        from /usr/lib64/ruby/2.3.0/mkmf.rb:997:in `block in have_library'
        from /usr/lib64/ruby/2.3.0/mkmf.rb:942:in `block in checking_for'
        from /usr/lib64/ruby/2.3.0/mkmf.rb:350:in `block (2 levels) in postpone'
        from /usr/lib64/ruby/2.3.0/mkmf.rb:320:in `open'
        from /usr/lib64/ruby/2.3.0/mkmf.rb:350:in `block in postpone'
        from /usr/lib64/ruby/2.3.0/mkmf.rb:320:in `open'
        from /usr/lib64/ruby/2.3.0/mkmf.rb:346:in `postpone'
        from /usr/lib64/ruby/2.3.0/mkmf.rb:941:in `checking_for'
        from /usr/lib64/ruby/2.3.0/mkmf.rb:992:in `have_library'
        from extconf.rb:6:in `<main>'

To see why this extension failed to compile, please check the mkmf.log which can be                                                                                     
found here:                                                                                                                                                             
                                                                                                                                                                        
$HOME/.gem/ruby/2.3.0/extensions/x86_64-linux/2.3.0/unf_ext-0.0.7.5/mkmf.log                                                                                     
                                                                                                                                                                        
extconf failed, exit code 1                                                                                                                                             
                                                                                                                                                                        
Gem files will remain installed in $HOME/.gem/ruby/2.3.0/gems/unf_ext-0.0.7.5                                                                                    
for inspection.                                                                                                                                                         
Results logged to                                                                                                                                                       
$HOME/.gem/ruby/2.3.0/extensions/x86_64-linux/2.3.0/unf_ext-0.0.7.5/gem_make.out                                                                                 
                                                                                                                                                                        
An error occurred while installing unf_ext (0.0.7.5), and Bundler cannot                                                                                                
continue.
Make sure that `gem install unf_ext -v '0.0.7.5'` succeeds before bundling.

In Gemfile:
  jekyll-webmention_io was resolved to 2.8.5, which depends on
    http was resolved to 2.2.2, which depends on
      http-cookie was resolved to 1.0.3, which depends on
        domain_name was resolved to 0.5.20170404, which depends on
          unf was resolved to 0.1.4, which depends on
            unf_ext

[grasp]

any solution on this?

[grasp]

my solution is : apt-get install g++

[silverhammermba]

Nothing to do with this extension:

checking for main() in -lstdc++... *** extconf.rb failed *** 

This is telling you that you don't have a C++ compiler installed. You won't be able to install any native extensions that use C++.

[Ryuno-Ki]

G++ is installed

LC_ALL=C g++ --version
g++ (Gentoo Hardened 6.4.0-r1 p1.3) 6.4.0
Copyright (C) 2017 Free Software Foundation, Inc.
This is free software; see the source for copying conditions.  There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

Still the same error.

[kjian]

same here:

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

/Users/kjian/.rvm/rubies/ruby-2.2.4/bin/ruby -r ./siteconf20180522-62521-1v2gv2c.rb extconf.rb

checking for main() in -lstdc++... yes
creating Makefile
...
unf was resolved to 0.1.4, which depends on
unf_ext

[kjian]

I have installed multiple Xcode in /Applications, when compiling unf_ext, it selected the wrong Xcode.

So, when i reset the compiling toolchain to default, it worked.

sudo xcode-select -r

[Ryuno-Ki]

Now we just need to find a pendant on Linux :-)

[JoshuaEdwards1991]

Any fix for this?

[kanstantsin-klachkou]

gem install unf_ext -v '0.0.7.5'

and then try again bundle install

[inertia186]

Well, it says to do that right in the error. Why didn't I think of that?

[talezion]

Any solutions?

I get the same error.

sudo gem install unf_ext -v '0.0.7.6' --source 'https://rubygems.org/'

I was setting fastlane with Firebase Distribution and had to run bundle update

fastlane add_plugin firebase_app_distribution

Fetching unf_ext 0.0.7.6
Installing unf_ext 0.0.7.6 with native extensions
Gem::Ext::BuildError: ERROR: Failed to build gem native extension.

An error occurred while installing unf_ext (0.0.7.6), and Bundler
cannot continue.
Make sure that `gem install unf_ext -v '0.0.7.6' --source
'https://rubygems.org/'` succeeds before bundling.

[talezion]

I updated ruby to 2.6.3 and is works now!

[marlti7]

Any fix for this?

[hokita]

Any fix for this? ruby 2.6.5 doesn't work

[KlausLiu]

Any fix for this? ruby 2.6.0 doesn't work

[AndiBrunner]

I had the same issue, installing ruby-dev helped.

$ sudo apt-get install ruby-dev