Where is mysql.h? This link provides the answer. Best to download the binary package and just untar it as per instructions.

http://docs.info.apple.com/article.html?artnum=306782

• file – will provide the file type information. in the case of a binary, it will give the components that makes up the binary
• readlink – will provide the libraries it is linked to

$ readlink /usr/bin/ruby
../../System/Library/Frameworks/Ruby.framework/Versions/Current/usr/bin/ruby
$ file /usr/lib/libruby.dylib
/usr/lib/libruby.dylib: Mach-O universal binary with 4 architectures
/usr/lib/libruby.dylib (for architecture ppc7400):   Mach-O dynamically linked shared library ppc
/usr/lib/libruby.dylib (for architecture ppc64):   Mach-O 64-bit dynamically linked shared library ppc64
/usr/lib/libruby.dylib (for architecture i386):   Mach-O dynamically linked shared library i386
/usr/lib/libruby.dylib (for architecture x86_64):   Mach-O 64-bit dynamically linked shared library x86_64

• postsuper – a command used for mail queue maintenance
• postfix reload – a command used to refresh postfix
• postconf -n – a command used to look at mail configuration
• /etc/postfix/master.cf – there is apprently a SMTP line that can cause the mail transport to not be able to find the SMTP port. Uncommenting the SMTP line will enable the service for external host delivery.

Obtain the OPFW command tool. Run the following commands

sudo ~/Desktop/OFPW -pass "your_firmware_password"
sudo ~/Desktop/OFPW -mode 1

Users will require a password to boot form any external devices other then the HDD.