Errors Installing mysql2 gem via the Bundler
bundler, mysql, ruby, ruby-on-rails, rubygems
Solution
Answer was similar to the one Wrikken posted -- here's what I did to fix it for the sake of future readers.
(This is for RHEL 5.5 -- similar but different commands apply for Ubuntu/Debian/etc.)
Doing `sudo yum list installed` will print out all installed packages on your machine (note: `yum` on RHEL requires you add a Red Hat Network repository [I use EPEL], and run it via `sudo`).
I had `mysql` and `mysql-server`, which explained why MySQL worked fine for every pre-existing app, but no `mysql-devel`, which is necessary to fix that `mysql.h is missing` error and similar other build errors.
Long story short, after a `mysqldump -u root -ppassword --all-databases > full-dump.sql` for safety, it was fixed with a simple
sudo yum install mysql-devel
Problem
I am trying to install the `mysql2` gem via the Bundler, but it keeps dying with the following error: ``` ** executing command /home/cc_rails/.rvm/rubies/ruby-1.9.2-p0/lib/ruby/1.9.1/rubygems/installer.rb:483:in 'rescue in block in build_extensions': ERROR: Failed to build gem native extension. (Gem::Installer::ExtensionBuildError) /home/cc_rails/.rvm/rubies/ruby-1.9.2-p0/bin/ruby extconf.rb --with-mysql-config=/usr/bin/mysql_config checking for rb_thread_blocking_region()... yes checking for mysql.h... no checking for mysql/mysql.h... no ----- mysql.h is missing. please check your installation of mysql and try again. ----- *** 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=/home/cc_rails/.rvm/rubies/ruby-1.9.2-p0/bin/ruby --with-mysql-config Gem files will remain installed for inspection. ``` Most things I found via Googling recommended passing the `--with-mysql-config` parameter to fix it. So, based on: ``` $ which mysql_config /usr/bin/mysql_config ``` I added the following to the Bundler's config: ``` $ bundle config build.mysql2 --with-mysql-config='/usr/bin/mysql_config' ``` However, still no luck -- same crash as above. Since it's dying with the error `mysql.h is missing`, I checked for that, and it's allegedly around, just can't be found by the Bundler. ``` $ find / -name mysql.h /usr/include/mysql5/mysql/mysql.h ``` Any thoughts?