Unable to install gem - Failed to build gem native extension - cannot load such file -- mkmf LoadError

Question

Ruby 1 9 3  The part of Gemfile                   gem  pony  gem  bcrypt-ruby    require   gt   bcrypt  gem  nokogiri                         When I m trying to install gems  I get an error  alex ubuntu     bundle Fetching gem metadata from http   rubygems org           Fetching gem metadata from http   rubygems org    Enter your password to install the bundled RubyGems to your system                                                                     Installing bcrypt-ruby  3 0 1  with native extensions  Gem  Installer  ExtensionBuildError  ERROR  Failed to build gem native extension            usr bin ruby1 9 1 extconf rb   usr lib ruby 1 9 1 rubygems custom require rb 36 in  require   cannot load such file -- mkmf  LoadError          from  usr lib ruby 1 9 1 rubygems custom require rb 36 in  require          from extconf rb 36 in   lt main gt     Gem files will remain installed in  home alex  bundler tmp 5526 gems bcrypt-ruby-3 0 1 for inspection  Results logged to  home alex  bundler tmp 5526 gems bcrypt-ruby-3 0 1 ext mri gem make out An error occurred while installing bcrypt-ruby  3 0 1   and Bundler cannot continue  Make sure that  gem install bcrypt-ruby -v  3 0 1   succeeds before bundling    Then I m doing this  sudo gem install bcrypt-ruby -v  3 0 1  Building native extensions   This could take a while    ERROR   Error installing bcrypt-ruby          ERROR  Failed to build gem native extension            usr bin ruby1 9 1 extconf rb  usr lib ruby 1 9 1 rubygems custom require rb 36 in  require   cannot load such file -- mkmf  LoadError          from  usr lib ruby 1 9 1 rubygems custom require rb 36 in  require          from extconf rb 36 in   lt main gt     Gem files will remain installed in  var lib gems 1 9 1 gems bcrypt-ruby-3 0 1 for inspection  Results logged to  var lib gems 1 9 1 gems bcrypt-ruby-3 0 1 ext mri gem make out   and getting an error as well   What did I miss

User · Answer

Just finished a 2 hour wild goose chase trying to solve this. None of the posted answers worked for me. Im on a Mac (Mojave Version 10.14.6, Xcode Version 11.3).

It turns out the ruby file headers were missing so i had to run open /Library/Developer/CommandLineTools/Packages/macOS_SDK_headers_for_macOS_10.14.pkg

That didnt work for me at first because the version of CommandLineTools i had installed did not have the "Packages" folder. So i uninstalled and reinstalled like this:

rm -rf /Library/Developer/CommandLineTools

xcode-select --install

Then i ran the previous command again:

open /Library/Developer/CommandLineTools/Packages/macOS_SDK_headers_for_macOS_10.14.pkg

After install the error was fixed!

User · Answer

I found that I needed to install another version of ruby  So running the command    sudo apt-get install ruby1 9 1-dev   and then attempt to install the extension  If you run into issues where it is telling you that you don t have g   you can run the following command to install it    sudo apt-get install g

User · Answer

After some search for a solution  it turns out the -dev package is needed  not just ruby1 8  So if you have ruby1 9 1 doing  sudo apt-get install ruby1 9 1-dev   or to install generic ruby version  use  as per  lamplightdev comment    sudo apt-get install ruby-dev   should fix it   Try to locate mkmf to see if the file is actually there

User · Answer

For MacOS users  Just do this and easily it will solve your problem  brew install cocoapods

User · Answer

There are similar questions      require  39   no such file to load -- mkmf  LoadError  Failed to build gem native extension  mkmf  LoadError   - Ubuntu 12 04   Usually  the solution is      sudo apt-get install ruby-dev   Or  if that doesn t work  depending on your ruby version  run something like      sudo apt-get install ruby1 9 1-dev   Should fix your problem     Still not working  Try the following after installing ruby-dev      sudo apt-get install make

User · Answer

I had the same issue trying to install jquery-rails  The fix was   sudo apt-get install zlibc zlib1g zlib1g-dev

User · Answer

For WSL  Windows Subsystem for Linux  you need install build-essential package   sudo apt install build-essential

User · Answer

In case anyone in the future had this problem  I m using a Mac and just had to install the Command Line Tools using  xcode-select --install

User · Answer

I created a small hackMD to install cocoapods on MacOS 10 15  Catalina  and 11  Big Sur  https   hackmd io  sBJPlhRESGqCKCqV8ZjP1A S1UY3W7HP Installing Cocoapods on MacOS Catalina MacOS 10 15 X  and Big Sur  MacOS 11   Make sure you have xcode components are installed   Download  Command Line Tools   about 500MB  directly from this link  Requires you to have apple account  https   developer apple com downloads index action  Install the downloaded file  Click on Install  Install COCOAPODS files in terminal sudo gem install -n  usr local bin cocoapods

User · Answer

In Mac  for me this works   CONFIGURE OPTS  --enable-shared  rbenv install 2 2 2

User · Answer

This worked for me   bundle config --global build snappy --with-opt-dir    brew --prefix snappy

User · Answer

Make sure ruby-dev is installed Make sure make is installed If you still get the error  look for suggested packages   If you are trying to install something like gem install pg you will also need to install the lib libpq-dev  sudo apt-get install libpq-dev

User · Answer

It also helps to ensure libmysqlclient-dev is installed  Ubuntu 14 04

User · Answer

What ended up working for me after a few hours of pain   if you re running brew   brew install ruby  in the terminal output log  identify the path where ruby was installed  brew suggests  You may want to add this to your PATH   so that s what we ll do  For example  mine is  usr local lib ruby gems 3 0 0 bin  Add this to your path by running  omitting braces  echo  export PATH quot  the path you found above   PATH quot    gt  gt     bash profile  then update your environment by running source    bash profile  now  try running your install  i e   sudo gem install middleman

[ruby-on-rails] Unable to install gem - Failed to build gem native extension - cannot load such file -- mkmf (LoadError)

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