ruby error

2013年10月15日

Gem::Installer::ExtensionBuildError: ERROR: Failed to build gem native extension.

/usr/local/bin/ruby extconf.rb
checking for rb_thread_blocking_region()… yes
checking for rb_wait_for_single_fd()… yes
checking for rb_hash_dup()… yes
checking for rb_intern3()… yes
checking for mysql_query() in -lmysqlclient… yes
checking for mysql.h… no
checking for mysql/mysql.h… yes
checking for errmsg.h… no
—–
errmsg.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=/usr/local/bin/ruby
–with-mysql-config
–without-mysql-config
–with-mysql-dir
–without-mysql-dir
–with-mysql-include
–without-mysql-include=${mysql-dir}/include
–with-mysql-lib
–without-mysql-lib=${mysql-dir}/lib
–with-mysqlclientlib
–without-mysqlclientlib

Gem files will remain installed in /usr/local/lib/ruby/gems/1.9.1/gems/mysql2-0.3.13 for inspection.
Results logged to /usr/local/lib/ruby/gems/1.9.1/gems/mysql2-0.3.13/ext/mysql2/gem_make.out

解決：export C_INCLUDE_PATH=/usr/include/mysql/