Ruby on Rails

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.

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