the issue for you. Hope that helps.
> My Mac OS X version is 10.6.6 Ruby version is 1.9.2 Rails version is
> 3.1 Please note that I have installed MAMP before. When I type gem
> install mysql2, a message shows:
> yeung-catoteki-iMac:~ catoyeung$ gem install mysql2
> Building native extensions. This could take a while...
> ERROR: Error installing mysql2:
> ERROR: Failed to build gem native extension.
> /Users/catoyeung/.rvm/rubies/ruby-1.9.2-p180/bin/ruby extconf.rb
> checking for rb_thread_blocking_region()... yes
> checking for mysql.h... yes
> checking for errmsg.h... yes
> checking for mysqld_error.h... yes
> creating Makefile
> make
> gcc -I. -I/Users/catoyeung/.rvm/rubies/ruby-1.9.2-p180/include/
> ruby-1.9.1/x86_64-darwin10.4.0 -I/Users/catoyeung/.rvm/rubies/
> ruby-1.9.2-p180/include/ruby-1.9.1/ruby/backward -I/Users/
> catoyeung/.rvm/rubies/ruby-1.9.2-p180/include/ruby-1.9.1 -I. -
> DHAVE_RB_THREAD_BLOCKING_REGION -DHAVE_MYSQL_H -DHAVE_ERRMSG_H -
> DHAVE_MYSQLD_ERROR_H -D_XOPEN_SOURCE -D_DARWIN_C_SOURCE -I/usr/local/
> mysql/include -g -Os -arch i386 -fno-common -D_P1003_1B_VISIBLE -
> DSIGNAL_WITH_VIO_CLOSE -DSIGNALS_DONT_BREAK_READ -
> DIGNORE_SIGHUP_SIGQUIT -DDONT_DECLARE_CXA_PURE_VIRTUAL -fno-common -
> O3 -ggdb -Wextra -Wno-unused-parameter -Wno-parentheses -Wpointer-
> arith -Wwrite-strings -Wno-missing-field-initializers -Wshorten-64-
> to-32 -Wno-long-long -fno-common -pipe -Wall -funroll-loops -o
> client.o -c client.c
> In file included from /Users/catoyeung/.rvm/rubies/ruby-1.9.2-p180/
> include/ruby-1.9.1/ruby.h:32,
> from ./mysql2_ext.h:8,
> from client.c:1:
> /Users/catoyeung/.rvm/rubies/ruby-1.9.2-p180/include/ruby-1.9.1/ruby/
> ruby.h:108: error: size of array ‘ruby_check_sizeof_long’ is negative
> /Users/catoyeung/.rvm/rubies/ruby-1.9.2-p180/include/ruby-1.9.1/ruby/
> ruby.h:112: error: size of array ‘ruby_check_sizeof_voidp’ is negative
> In file included from /Users/catoyeung/.rvm/rubies/ruby-1.9.2-p180/
> include/ruby-1.9.1/ruby/intern.h:29,
> from /Users/catoyeung/.rvm/rubies/ruby-1.9.2-p180/include/
> ruby-1.9.1/ruby/ruby.h:1327,
> from /Users/catoyeung/.rvm/rubies/ruby-1.9.2-p180/include/
> ruby-1.9.1/ruby.h:32,
> from ./mysql2_ext.h:8,
> from client.c:1:
> /Users/catoyeung/.rvm/rubies/ruby-1.9.2-p180/include/ruby-1.9.1/ruby/
> st.h:69: error: size of array ‘st_check_for_sizeof_st_index_t’ is
> negative
> make: *** [client.o] Error 1
> Gem files will remain installed in /Users/catoyeung/.rvm/gems/
> ruby-1.9.2- p180@rails3_1/gems/mysql2-0.3.7 for inspection.
> Results logged to /Users/catoyeung/.rvm/gems/ruby-1.9.2-p180@rails3_1/
> gems/mysql2-0.3.7/ext/mysql2/gem_make.out
> Experts, please help.
