I installed the MySQL server with the installer from http://dev.mysql.com/downloads/mysql . Then, as explained in several manuals, I wanted to install gem mysql with the following command.
sudo gem install mysql
This does not work and gives the following result.
Building native extensions. This could take a while... ERROR: Error installing mysql: ERROR: Failed to build gem native extension. /Users/luzi/.rvm/rubies/ruby-1.9.3-p429/bin/ruby extconf.rb --with-mysql-dir=/usr/local/mysql/ checking for mysql_ssl_set()... *** 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 --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=/Users/luzi/.rvm/rubies/ruby-1.9.3-p429/bin/ruby --with-mysql-config --without-mysql-config /Users/luzi/.rvm/rubies/ruby-1.9.3-p429/lib/ruby/1.9.1/mkmf.rb:381:in `try_do': The compiler failed to generate an executable file. (RuntimeError) You have to install development tools first. from /Users/luzi/.rvm/rubies/ruby-1.9.3-p429/lib/ruby/1.9.1/mkmf.rb:461:in `try_link0' from /Users/luzi/.rvm/rubies/ruby-1.9.3-p429/lib/ruby/1.9.1/mkmf.rb:476:in `try_link' from /Users/luzi/.rvm/rubies/ruby-1.9.3-p429/lib/ruby/1.9.1/mkmf.rb:619:in `try_func' from /Users/luzi/.rvm/rubies/ruby-1.9.3-p429/lib/ruby/1.9.1/mkmf.rb:894:in `block in have_func' from /Users/luzi/.rvm/rubies/ruby-1.9.3-p429/lib/ruby/1.9.1/mkmf.rb:790:in `block in checking_for' from /Users/luzi/.rvm/rubies/ruby-1.9.3-p429/lib/ruby/1.9.1/mkmf.rb:284:in `block (2 levels) in postpone' from /Users/luzi/.rvm/rubies/ruby-1.9.3-p429/lib/ruby/1.9.1/mkmf.rb:254:in `open' from /Users/luzi/.rvm/rubies/ruby-1.9.3-p429/lib/ruby/1.9.1/mkmf.rb:284:in `block in postpone' from /Users/luzi/.rvm/rubies/ruby-1.9.3-p429/lib/ruby/1.9.1/mkmf.rb:254:in `open' from /Users/luzi/.rvm/rubies/ruby-1.9.3-p429/lib/ruby/1.9.1/mkmf.rb:280:in `postpone' from /Users/luzi/.rvm/rubies/ruby-1.9.3-p429/lib/ruby/1.9.1/mkmf.rb:789:in `checking_for' from /Users/luzi/.rvm/rubies/ruby-1.9.3-p429/lib/ruby/1.9.1/mkmf.rb:893:in `have_func' from extconf.rb:45:in `<main>' Gem files will remain installed in /Users/luzi/.rvm/gems/ruby-1.9.3-p429/gems/mysql-2.9.1 for inspection. Results logged to /Users/luzi/.rvm/gems/ruby-1.9.3-p429/gems/mysql-2.9.1/ext/mysql_api/gem_make.out
I reinstalled ruby 1.9.3 several times. Xcode command line utilities are also installed. I also installed mysql server with homebrew (brought nothing).
I also tried some options for the command above, for example --with-mysql-dir=/usr/local/mysql and --with-mysql-config=/usr/local/mysql/bin/mysql_config . Passing flags ( sudo env ARCHFLAGS="-arch x86_64" gem install mysql ) did not help either.
UPDATE
I also tried gem mysql2 with the result of the same error, probably because the mysql2 stone is dependent on the gem mysql.
UPDATE 2 :
Content mkmf.log :
"/opt/local/bin/gcc-apple-4.2 -o conftest -I/Users/luzi/.rvm/rubies/ruby-1.9.3-p429/include/ruby-1.9.1/x86_64-darwin12.4.0 -I/Users/luzi/.rvm/rubies/ruby-1.9.3-p429/include/ruby-1.9.1/ruby/backward -I/Users/luzi/.rvm/rubies/ruby-1.9.3-p429/include/ruby-1.9.1 -I. -D_XOPEN_SOURCE -D_DARWIN_C_SOURCE -I/opt/local/include -I/usr/local/mysql/include -Wno-null-conversion -Os -g -fno-strict-aliasing -arch x86_64 -O3 -ggdb -Wall -Wextra -Wno-unused-parameter -Wno-parentheses -Wno-long-long -Wno-missing-field-initializers -Wpointer-arith -Wwrite-strings -Wdeclaration-after-statement -Wshorten-64-to-32 -Wimplicit-function-declaration -fno-common -pipe conftest.c -L. -L/Users/luzi/.rvm/rubies/ruby-1.9.3-p429/lib -L/opt/local/lib -L. -L/usr/local/lib -L/opt/local/lib -L/usr/local/mysql/lib -lmysqlclient -lruby.1.9.1 -lpthread -ldl -lobjc " cc1: error: unrecognized command line option "-Wno-null-conversion" checked program was: 1: #include "ruby.h" 2: 3: int main(int argc, char **argv) 4: { 5: return 0; 6: }
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