尽管系统中存在 mysql.h，但我在 Arch Linux 上遇到了这个错误。有谁知道如何解决这个问题？以下是一些要害：
$ find /usr -name mysql.h
/usr/include/mysql/mysql.h
$ echo $PATH
/home/chris/.rvm/gems/ruby-1.8.7-p302@bogen/bin:/home/chris/.rvm/gems/ruby-1.8.7-p302@global/bin:/home/chris/.rvm/rubies/ruby-1.8.7-p302/bin:/home/chris/.rvm/bin:/bin:/usr/bin:/usr/lib:/sbin:/usr/sbin:/home/chris/bin:/home/chris/lib:/usr/share/eclipse:/opt/kde/bin:/usr/bin/perlbin/site:/usr/bin/perlbin/vendor:/usr/bin/perlbin/core:/opt/qt/bin:/usr/include:/usr/local/include:/opt/ruby1.8/bin:/usr/local/bin:/usr/local/sbin:/usr/bin/vendor_perl:/usr/bin/core_perl
这是确切的输出gem install mysql
$ which ruby
/home/chris/.rvm/rubies/ruby-1.8.7-p302/bin/ruby
$ gem install mysql
Building native extensions. This could take a while...
ERROR: Error installing mysql:
ERROR: Failed to build gem native extension.
/home/chris/.rvm/rubies/ruby-1.8.7-p302/bin/ruby extconf.rb
checking for mysql_ssl_set()... no
checking for rb_str_set_len()... no
checking for rb_thread_start_timer()... no
checking for mysql.h... no
checking for mysql/mysql.h... no
*** 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/chris/.rvm/rubies/ruby-1.8.7-p302/bin/ruby
--with-mysql-config
--without-mysql-config
Gem files will remain installed in /home/chris/.rvm/gems/ruby-1.8.7-p302@bogen/gems/mysql-2.8.1 for inspection.
Results logged to /home/chris/.rvm/gems/ruby-1.8.7-p302@bogen/gems/mysql-2.8.1/ext/mysql_api/gem_make.out
因为这是 Arch linux，所以没有像 Ubuntu 或 CentOS 这样的开发包。我尝试过的上述命令的变体包括：
gem install mysql -- --with-mysql-include=/usr/include/mysql --with-mysql-config
gem install mysql -- --with-mysql-include=/usr/include/mysql
gem install mysql -- --with-mysql-include=/usr/include
一切都无济于事。不幸的是，我能够找到的所有其他有关此错误的报告要么与 Mac OS 有关，要么与其他 Linux 发行版上缺少开发包有关。由于头文件在我的情况下并且似乎在标准位置，因此我不确定接下来要尝试什么。任何提示将不胜感激。