If you installed MySQL using the official .dmg package provided by MySQL AB/Sun and are trying to install the native MySQL gem, you’ll need to pass a bunch of flags to the gem install process to get the thing to compile. Try this..

sudo gem install mysql — –with-mysql-config=/usr/local/mysql/bin/mysql_config

..if you still have issues (check your /opt/local/lib/ruby/gems/<ruby_ver>/gems/mysql-<gem_ver>/mkmf.log file), try this instead..

sudo gem install mysql — –with-mysql-dir=/usr/local/mysql –with-mysql-include=/usr/local/mysql/include/ –with-mysql-lib=/usr/local/mysql/lib/ –with-mysql-config=/usr/local/mysql/bin/mysql_config

Run `sudo gem install mysql` and definitely recheck the log file again as the gem install process sometimes reports false positives even if native components fail to install.

preston$ sudo gem install mechanize
Password: ********

Bulk updating Gem source index for: http://gems.rubyforge.org
Install required dependency hpricot? [Yn]
Select which gem to install for your platform (i686-darwin8.10.3)
1. hpricot 0.6 (mswin32)
2. hpricot 0.6 (jruby)
3. hpricot 0.6 (ruby)
4. hpricot 0.5 (ruby)
5. hpricot 0.5 (mswin32)
6. Skip this gem
7. Cancel installation
> 3
Building native extensions. This could take a while…
ERROR: While executing gem … (Gem::Installer::ExtensionBuildError)
ERROR: Failed to build gem native extension.

ruby extconf.rb install mechanize
checking for main() in -lc… no
creating Makefile

make
gcc -I. -I. -I/opt/local/lib/ruby/1.8/i686-darwin8.10.3 -I. -I/opt/local/include -fno-common -O2 -fno-common -pipe -fno-common -c hpricot_scan.c
cc -dynamic -bundle -undefined suppress -flat_namespace -L/opt/local/lib -L”/opt/local/lib” -o hpricot_scan.bundle hpricot_scan.o -lruby -lpthread -ldl -lobjc
/usr/bin/ld: /usr/lib/gcc/i686-apple-darwin8/4.0.1/../../../libpthread.dylib unknown flags (type) of section 6 (__TEXT,__dof_plockstat) in load command 0
/usr/bin/ld: /usr/lib/gcc/i686-apple-darwin8/4.0.1/../../../libdl.dylib unknown flags (type) of section 6 (__TEXT,__dof_plockstat) in load command 0
/usr/bin/ld: /usr/lib/gcc/i686-apple-darwin8/4.0.1/../../../libobjc.dylib load command 9 unknown cmd field
/usr/bin/ld: /usr/lib/gcc/i686-apple-darwin8/4.0.1/../../../libSystem.dylib unknown flags (type) of section 6 (__TEXT,__dof_plockstat) in load command 0
/usr/bin/ld: /usr/lib/libSystem.B.dylib unknown flags (type) of section 6 (__TEXT,__dof_plockstat) in load command 0
collect2: ld returned 1 exit status
make: *** [hpricot_scan.bundle] Error 1

Gem files will remain installed in /opt/local/lib/ruby/gems/1.8/gems/hpricot-0.6 for inspection.
Results logged to /opt/local/lib/ruby/gems/1.8/gems/hpricot-0.6/ext/hpricot_scan/gem_make.out

The issue is that Xcode 3 must be upgraded as well; Hpricot’s native components cannot be built with the older Tiger development tools on Leopard. After installing Xcode 3 from either your Leopard DVD or Apple Developer Connection, run the install again…

preston$ sudo gem install mechanize

Install required dependency hpricot? [Yn] Y
Select which gem to install for your platform (i686-darwin8.10.3)
1. hpricot 0.6 (mswin32)
2. hpricot 0.6 (jruby)
3. hpricot 0.6 (ruby)
4. hpricot 0.5 (ruby)
5. hpricot 0.5 (mswin32)
6. Skip this gem
7. Cancel installation
> 3
Building native extensions. This could take a while…
Successfully installed mechanize-0.6.11
Successfully installed hpricot-0.6
Installing ri documentation for mechanize-0.6.11…
Installing ri documentation for hpricot-0.6…
Installing RDoc documentation for mechanize-0.6.11…
Installing RDoc documentation for hpricot-0.6…

Success!

1. Download the Solaris x64 .pkg.
2. `pkgadd -d oss-solaris-v4.0-1004-i386.pkg`
3. `osstest`. You should here the sweet sweet sound of.. umm.. sound, and the following printed on the console..

bash-3.00$ osstest
Sound subsystem and version: OSS 4.0 (build 1004/200707062145) (0×00040002)
Platform: SunOS/i86pc 5.10 Generic_118855-33

*** Scanning sound adapter #-1 ***
/dev/oss/hdaudio0/pcm0 (audio engine 0): nVidia HD Audio play-front output
Note! Device is in use (by PID 0/VMIX) but will try anyway
- Performing audio playback test…
OK OK OK
/dev/oss/hdaudio0/pcm1 (audio engine 1): nVidia HD Audio play-side output
- Performing audio playback test…
OK OK OK
/dev/oss/hdaudio0/pcm2 (audio engine 2): nVidia HD Audio play-center/LFE output
- Performing audio playback test…
OK OK OK
/dev/oss/hdaudio0/spdout0 (audio engine 3): nVidia HD Audio spdif output
- Performing audio playback test…
OK OK OK
/dev/oss/hdaudio0/pcmin0 (audio engine 4): nVidia HD Audio record input
- Skipping input only device

*** All tests completed OK ***

Generating HTML…
Diagrams: ./opt/local/lib/ruby/vendor_ruby/1.8/rubygems/custom_require.rb:27: command not found: dot -Tismap dot/f_0.dot
./opt/local/lib/ruby/vendor_ruby/1.8/rubygems/custom_require.rb:27: command not found: dot -Tismap dot/f_1.dot

..the package you need to install is called graphviz. You can install it using Darwin Ports on OS X like so..

sudo port install graphviz